Overheating '86 5000 TQ
#21
Guest
Posts: n/a
Re: Overheating '86 5000 TQ
Thank you Tony and Steve! I am going to print your posts out for the mechanic,
"Tony" <tonyjnospam@nospamvisi.com> wrote in message news:11730o99iavpnd7@corp.supernews.com...
> Is your radiator cooling fan running when it should?
>
> - Low speed when the air conditioner is on
> - Fan speed two when at the larger 100C mark or just a bit higher.
> - Speed three when close to next higher mark. (Usually happens in stopped traffic)
>
> If not you may have:
> - a bad thermo switch on the bottom of the radiator
> - any of three fan relays not operating
> - failed resistor pack on frame under radiator
> - Seized fan bearings
>
> If it doesn't look like a head gasket you might also want to pull the thermostat to check its operation.
>
> Clogged radiator is possible. If lower radiator hose is a lot cooler than the top one the rad is probably clogged.
>
> Steve's suggestion of a bad baffel in the rad is also quite possible.
>
> Tonyj
> just sold: '91 100q 5spd (4th T44)
> current 98.5 A4 1.8TQ 5spd APR
>
> cp wrote:
>> Steve, I've checked the oil and coolant, both look as they should. The oil is 2000km old and still looks like new. The coolant is
>> bright green, still think it could be a blown gasket?
>>
>> Thank you again, people like you put the 'news' in newsgroup
>>
>> cp
>>
>>
>>>cp,
>>>chances are that it's a blown head gasket. Pull the plugs and check the
>>>colour. If one plug is a different colour, chances are the cylinder is
>>>leaking. You can do a compression test (small differences can tell of a
>>>head gasket leak). I was also told to pull the plugs with the engine warm,
>>>and hold an inspection mirror over the plug holes, if it fogs, there's a
>>>coolant leak. Unfortunately, every time the engine overheats, there's a
>>>risk of head warping as the aluminum head and cast iron block do not behave
>>>the same as they cool down - so the failure will only get worse. (BTDT - hg
>>>replaced, head planed)
>>>If it isn't a hg leak (I'm sure you're hoping that it's not), check the
>>>temperature of the rad. If there is a noticible temperature gradient - like
>>>the engine side is hotter than the fender side, the gasket between the hot
>>>and cold ports may have failed and coolant is bypassing the rad. (BTDT -
>>>brass radiator replaced failed plastic rad))
>>>If you're planning on doing a flush&fill, make sure they do it with the rad
>>>disconnected and then do the rad separately to avoid rust & junk from the
>>>engine clogging the rad. The thermostat is easy to test - put it in cooking
>>>oil on the stove with a thermometer in the pot - make sure it opens at the
>>>temp stamped on the flange. It doesn't sound like a t-stat failure, though,
>>>usually they fail open and your car will take forever to warm up.
>>>Cheers!
>>>Steve Sears
>>>1987 Audi 5kTQ
>>>1980 Audi 5k
>>>1962 and '64 Auto Union DKW Junior deLuxes
>>>(SPAM Blocker NOTE: Remove SHOES to reply)
>>>
>>>"cp" <asdf@adsf.com> wrote in message news:ae_be.5622$3V3.344@edtnps89...
>>>
>>>>Hi, my '86 5000 TQ has been run above 100C temperatures for the past
>>>
>>>couple hundred of kilometers and finally today it overheated
>>>
>>>>twice, (coolant leaked out and the temperature warning light came on),
>>>
>>>once at night when I was driving it slowly home. I was afraid
>>>
>>>>that perhaps the head gasket is blown but the car drives great and I
>>>
>>>cannot see any tell-tale exhaust, which leads me to think that
>>>
>>>>either it needs a new thermostat or a radiator flush. Is there anything
>>>
>>>else that could be causing this?
>>>
>>>>TIA
>>>>cp
>>>>
>>>>
>>>
>>>
>>
"Tony" <tonyjnospam@nospamvisi.com> wrote in message news:11730o99iavpnd7@corp.supernews.com...
> Is your radiator cooling fan running when it should?
>
> - Low speed when the air conditioner is on
> - Fan speed two when at the larger 100C mark or just a bit higher.
> - Speed three when close to next higher mark. (Usually happens in stopped traffic)
>
> If not you may have:
> - a bad thermo switch on the bottom of the radiator
> - any of three fan relays not operating
> - failed resistor pack on frame under radiator
> - Seized fan bearings
>
> If it doesn't look like a head gasket you might also want to pull the thermostat to check its operation.
>
> Clogged radiator is possible. If lower radiator hose is a lot cooler than the top one the rad is probably clogged.
>
> Steve's suggestion of a bad baffel in the rad is also quite possible.
>
> Tonyj
> just sold: '91 100q 5spd (4th T44)
> current 98.5 A4 1.8TQ 5spd APR
>
> cp wrote:
>> Steve, I've checked the oil and coolant, both look as they should. The oil is 2000km old and still looks like new. The coolant is
>> bright green, still think it could be a blown gasket?
>>
>> Thank you again, people like you put the 'news' in newsgroup
>>
>> cp
>>
>>
>>>cp,
>>>chances are that it's a blown head gasket. Pull the plugs and check the
>>>colour. If one plug is a different colour, chances are the cylinder is
>>>leaking. You can do a compression test (small differences can tell of a
>>>head gasket leak). I was also told to pull the plugs with the engine warm,
>>>and hold an inspection mirror over the plug holes, if it fogs, there's a
>>>coolant leak. Unfortunately, every time the engine overheats, there's a
>>>risk of head warping as the aluminum head and cast iron block do not behave
>>>the same as they cool down - so the failure will only get worse. (BTDT - hg
>>>replaced, head planed)
>>>If it isn't a hg leak (I'm sure you're hoping that it's not), check the
>>>temperature of the rad. If there is a noticible temperature gradient - like
>>>the engine side is hotter than the fender side, the gasket between the hot
>>>and cold ports may have failed and coolant is bypassing the rad. (BTDT -
>>>brass radiator replaced failed plastic rad))
>>>If you're planning on doing a flush&fill, make sure they do it with the rad
>>>disconnected and then do the rad separately to avoid rust & junk from the
>>>engine clogging the rad. The thermostat is easy to test - put it in cooking
>>>oil on the stove with a thermometer in the pot - make sure it opens at the
>>>temp stamped on the flange. It doesn't sound like a t-stat failure, though,
>>>usually they fail open and your car will take forever to warm up.
>>>Cheers!
>>>Steve Sears
>>>1987 Audi 5kTQ
>>>1980 Audi 5k
>>>1962 and '64 Auto Union DKW Junior deLuxes
>>>(SPAM Blocker NOTE: Remove SHOES to reply)
>>>
>>>"cp" <asdf@adsf.com> wrote in message news:ae_be.5622$3V3.344@edtnps89...
>>>
>>>>Hi, my '86 5000 TQ has been run above 100C temperatures for the past
>>>
>>>couple hundred of kilometers and finally today it overheated
>>>
>>>>twice, (coolant leaked out and the temperature warning light came on),
>>>
>>>once at night when I was driving it slowly home. I was afraid
>>>
>>>>that perhaps the head gasket is blown but the car drives great and I
>>>
>>>cannot see any tell-tale exhaust, which leads me to think that
>>>
>>>>either it needs a new thermostat or a radiator flush. Is there anything
>>>
>>>else that could be causing this?
>>>
>>>>TIA
>>>>cp
>>>>
>>>>
>>>
>>>
>>
#22
Guest
Posts: n/a
Re: Overheating '86 5000 TQ
Thank you Tony and Steve! I am going to print your posts out for the mechanic,
"Tony" <tonyjnospam@nospamvisi.com> wrote in message news:11730o99iavpnd7@corp.supernews.com...
> Is your radiator cooling fan running when it should?
>
> - Low speed when the air conditioner is on
> - Fan speed two when at the larger 100C mark or just a bit higher.
> - Speed three when close to next higher mark. (Usually happens in stopped traffic)
>
> If not you may have:
> - a bad thermo switch on the bottom of the radiator
> - any of three fan relays not operating
> - failed resistor pack on frame under radiator
> - Seized fan bearings
>
> If it doesn't look like a head gasket you might also want to pull the thermostat to check its operation.
>
> Clogged radiator is possible. If lower radiator hose is a lot cooler than the top one the rad is probably clogged.
>
> Steve's suggestion of a bad baffel in the rad is also quite possible.
>
> Tonyj
> just sold: '91 100q 5spd (4th T44)
> current 98.5 A4 1.8TQ 5spd APR
>
> cp wrote:
>> Steve, I've checked the oil and coolant, both look as they should. The oil is 2000km old and still looks like new. The coolant is
>> bright green, still think it could be a blown gasket?
>>
>> Thank you again, people like you put the 'news' in newsgroup
>>
>> cp
>>
>>
>>>cp,
>>>chances are that it's a blown head gasket. Pull the plugs and check the
>>>colour. If one plug is a different colour, chances are the cylinder is
>>>leaking. You can do a compression test (small differences can tell of a
>>>head gasket leak). I was also told to pull the plugs with the engine warm,
>>>and hold an inspection mirror over the plug holes, if it fogs, there's a
>>>coolant leak. Unfortunately, every time the engine overheats, there's a
>>>risk of head warping as the aluminum head and cast iron block do not behave
>>>the same as they cool down - so the failure will only get worse. (BTDT - hg
>>>replaced, head planed)
>>>If it isn't a hg leak (I'm sure you're hoping that it's not), check the
>>>temperature of the rad. If there is a noticible temperature gradient - like
>>>the engine side is hotter than the fender side, the gasket between the hot
>>>and cold ports may have failed and coolant is bypassing the rad. (BTDT -
>>>brass radiator replaced failed plastic rad))
>>>If you're planning on doing a flush&fill, make sure they do it with the rad
>>>disconnected and then do the rad separately to avoid rust & junk from the
>>>engine clogging the rad. The thermostat is easy to test - put it in cooking
>>>oil on the stove with a thermometer in the pot - make sure it opens at the
>>>temp stamped on the flange. It doesn't sound like a t-stat failure, though,
>>>usually they fail open and your car will take forever to warm up.
>>>Cheers!
>>>Steve Sears
>>>1987 Audi 5kTQ
>>>1980 Audi 5k
>>>1962 and '64 Auto Union DKW Junior deLuxes
>>>(SPAM Blocker NOTE: Remove SHOES to reply)
>>>
>>>"cp" <asdf@adsf.com> wrote in message news:ae_be.5622$3V3.344@edtnps89...
>>>
>>>>Hi, my '86 5000 TQ has been run above 100C temperatures for the past
>>>
>>>couple hundred of kilometers and finally today it overheated
>>>
>>>>twice, (coolant leaked out and the temperature warning light came on),
>>>
>>>once at night when I was driving it slowly home. I was afraid
>>>
>>>>that perhaps the head gasket is blown but the car drives great and I
>>>
>>>cannot see any tell-tale exhaust, which leads me to think that
>>>
>>>>either it needs a new thermostat or a radiator flush. Is there anything
>>>
>>>else that could be causing this?
>>>
>>>>TIA
>>>>cp
>>>>
>>>>
>>>
>>>
>>
"Tony" <tonyjnospam@nospamvisi.com> wrote in message news:11730o99iavpnd7@corp.supernews.com...
> Is your radiator cooling fan running when it should?
>
> - Low speed when the air conditioner is on
> - Fan speed two when at the larger 100C mark or just a bit higher.
> - Speed three when close to next higher mark. (Usually happens in stopped traffic)
>
> If not you may have:
> - a bad thermo switch on the bottom of the radiator
> - any of three fan relays not operating
> - failed resistor pack on frame under radiator
> - Seized fan bearings
>
> If it doesn't look like a head gasket you might also want to pull the thermostat to check its operation.
>
> Clogged radiator is possible. If lower radiator hose is a lot cooler than the top one the rad is probably clogged.
>
> Steve's suggestion of a bad baffel in the rad is also quite possible.
>
> Tonyj
> just sold: '91 100q 5spd (4th T44)
> current 98.5 A4 1.8TQ 5spd APR
>
> cp wrote:
>> Steve, I've checked the oil and coolant, both look as they should. The oil is 2000km old and still looks like new. The coolant is
>> bright green, still think it could be a blown gasket?
>>
>> Thank you again, people like you put the 'news' in newsgroup
>>
>> cp
>>
>>
>>>cp,
>>>chances are that it's a blown head gasket. Pull the plugs and check the
>>>colour. If one plug is a different colour, chances are the cylinder is
>>>leaking. You can do a compression test (small differences can tell of a
>>>head gasket leak). I was also told to pull the plugs with the engine warm,
>>>and hold an inspection mirror over the plug holes, if it fogs, there's a
>>>coolant leak. Unfortunately, every time the engine overheats, there's a
>>>risk of head warping as the aluminum head and cast iron block do not behave
>>>the same as they cool down - so the failure will only get worse. (BTDT - hg
>>>replaced, head planed)
>>>If it isn't a hg leak (I'm sure you're hoping that it's not), check the
>>>temperature of the rad. If there is a noticible temperature gradient - like
>>>the engine side is hotter than the fender side, the gasket between the hot
>>>and cold ports may have failed and coolant is bypassing the rad. (BTDT -
>>>brass radiator replaced failed plastic rad))
>>>If you're planning on doing a flush&fill, make sure they do it with the rad
>>>disconnected and then do the rad separately to avoid rust & junk from the
>>>engine clogging the rad. The thermostat is easy to test - put it in cooking
>>>oil on the stove with a thermometer in the pot - make sure it opens at the
>>>temp stamped on the flange. It doesn't sound like a t-stat failure, though,
>>>usually they fail open and your car will take forever to warm up.
>>>Cheers!
>>>Steve Sears
>>>1987 Audi 5kTQ
>>>1980 Audi 5k
>>>1962 and '64 Auto Union DKW Junior deLuxes
>>>(SPAM Blocker NOTE: Remove SHOES to reply)
>>>
>>>"cp" <asdf@adsf.com> wrote in message news:ae_be.5622$3V3.344@edtnps89...
>>>
>>>>Hi, my '86 5000 TQ has been run above 100C temperatures for the past
>>>
>>>couple hundred of kilometers and finally today it overheated
>>>
>>>>twice, (coolant leaked out and the temperature warning light came on),
>>>
>>>once at night when I was driving it slowly home. I was afraid
>>>
>>>>that perhaps the head gasket is blown but the car drives great and I
>>>
>>>cannot see any tell-tale exhaust, which leads me to think that
>>>
>>>>either it needs a new thermostat or a radiator flush. Is there anything
>>>
>>>else that could be causing this?
>>>
>>>>TIA
>>>>cp
>>>>
>>>>
>>>
>>>
>>
#26
Guest
Posts: n/a
Re: Overheating '86 5000 TQ
"cp" <asdf@adsf.com> wrote in message news:ae_be.5622$3V3.344@edtnps89...
> Hi, my '86 5000 TQ has been run above 100C temperatures for the past
couple hundred of kilometers and finally today it overheated
> twice, (coolant leaked out and the temperature warning light came on),
once at night when I was driving it slowly home. I was afraid
> that perhaps the head gasket is blown but the car drives great and I
cannot see any tell-tale exhaust, which leads me to think that
> either it needs a new thermostat or a radiator flush. Is there anything
else that could be causing this?
>
> TIA
> cp
I would guess you'd need more than a flush - likely a new radiator. If
there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
you've blown the head gasket. Good luck!
> Hi, my '86 5000 TQ has been run above 100C temperatures for the past
couple hundred of kilometers and finally today it overheated
> twice, (coolant leaked out and the temperature warning light came on),
once at night when I was driving it slowly home. I was afraid
> that perhaps the head gasket is blown but the car drives great and I
cannot see any tell-tale exhaust, which leads me to think that
> either it needs a new thermostat or a radiator flush. Is there anything
else that could be causing this?
>
> TIA
> cp
I would guess you'd need more than a flush - likely a new radiator. If
there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
you've blown the head gasket. Good luck!
#27
Guest
Posts: n/a
Re: Overheating '86 5000 TQ
"cp" <asdf@adsf.com> wrote in message news:ae_be.5622$3V3.344@edtnps89...
> Hi, my '86 5000 TQ has been run above 100C temperatures for the past
couple hundred of kilometers and finally today it overheated
> twice, (coolant leaked out and the temperature warning light came on),
once at night when I was driving it slowly home. I was afraid
> that perhaps the head gasket is blown but the car drives great and I
cannot see any tell-tale exhaust, which leads me to think that
> either it needs a new thermostat or a radiator flush. Is there anything
else that could be causing this?
>
> TIA
> cp
I would guess you'd need more than a flush - likely a new radiator. If
there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
you've blown the head gasket. Good luck!
> Hi, my '86 5000 TQ has been run above 100C temperatures for the past
couple hundred of kilometers and finally today it overheated
> twice, (coolant leaked out and the temperature warning light came on),
once at night when I was driving it slowly home. I was afraid
> that perhaps the head gasket is blown but the car drives great and I
cannot see any tell-tale exhaust, which leads me to think that
> either it needs a new thermostat or a radiator flush. Is there anything
else that could be causing this?
>
> TIA
> cp
I would guess you'd need more than a flush - likely a new radiator. If
there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
you've blown the head gasket. Good luck!
#28
Guest
Posts: n/a
Re: Overheating '86 5000 TQ
"cp" <asdf@adsf.com> wrote in message news:ae_be.5622$3V3.344@edtnps89...
> Hi, my '86 5000 TQ has been run above 100C temperatures for the past
couple hundred of kilometers and finally today it overheated
> twice, (coolant leaked out and the temperature warning light came on),
once at night when I was driving it slowly home. I was afraid
> that perhaps the head gasket is blown but the car drives great and I
cannot see any tell-tale exhaust, which leads me to think that
> either it needs a new thermostat or a radiator flush. Is there anything
else that could be causing this?
>
> TIA
> cp
I would guess you'd need more than a flush - likely a new radiator. If
there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
you've blown the head gasket. Good luck!
> Hi, my '86 5000 TQ has been run above 100C temperatures for the past
couple hundred of kilometers and finally today it overheated
> twice, (coolant leaked out and the temperature warning light came on),
once at night when I was driving it slowly home. I was afraid
> that perhaps the head gasket is blown but the car drives great and I
cannot see any tell-tale exhaust, which leads me to think that
> either it needs a new thermostat or a radiator flush. Is there anything
else that could be causing this?
>
> TIA
> cp
I would guess you'd need more than a flush - likely a new radiator. If
there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
you've blown the head gasket. Good luck!
#29
Guest
Posts: n/a
Re: Overheating '86 5000 TQ
> I would guess you'd need more than a flush - likely a new radiator. If
> there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
> you've blown the head gasket. Good luck!
I hope you're right! I'm going to try all the steps that have been suggested!
cp
> there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
> you've blown the head gasket. Good luck!
I hope you're right! I'm going to try all the steps that have been suggested!
cp
#30
Guest
Posts: n/a
Re: Overheating '86 5000 TQ
> I would guess you'd need more than a flush - likely a new radiator. If
> there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
> you've blown the head gasket. Good luck!
I hope you're right! I'm going to try all the steps that have been suggested!
cp
> there's no tell-tale smoke and you didn't lose a lot of coolant, I doubt
> you've blown the head gasket. Good luck!
I hope you're right! I'm going to try all the steps that have been suggested!
cp