Re: A4 1,8 TS coolant temp reads low
 

moparmadman wrote:
> I just ran into the same exact problem on the same application. It was
> the thermostat.I picked up the part at the dealer.If you are not
> mechanically inclined do not attempt to replace it.It has a plastic
> housing and is behind the alternator and steering pump.It also has a
> sensor on the housing.I went through the same thing replacing the green
> sensor,it was not the problem.when i removed the whole housing and took it
> apart i found that the plastic tabs that held the thermostat in place broke
> off which caused the thermostat to remain open.I purchased the whole
> housing,it came with everthing that i needed,it was a little over a $100
> but worth it.replaced it and problem resolved.
>
>

Thanks for this good info. I have just replaced the temp sensor but I
notice that the temp is now only a couple of degrees higher, so it may
indeed be a sticking thermostat.

Some questions:

1) was your only problem a low temperature or did you have other
symptoms that caused you to want to replace the thermostat?

2) did you have to remove more than the undertray to get to the pump, or
did you also have to remove the cowling around the timing belt?

3) were the plastic tabs broken through general wear and age, or did
they get broken as a result of your dismantling job?

4) Can you say more about this sensor on the housing - I cannot see one
in the pics on the Haynes manual, but their material is incomplete as a
matter of course.

Grateful for any additional info you can provide.

Thanks, Robert

Re: A4 1,8 TS coolant temp reads low
 

moparmadman wrote:
> I just ran into the same exact problem on the same application. It was
> the thermostat.I picked up the part at the dealer.If you are not
> mechanically inclined do not attempt to replace it.It has a plastic
> housing and is behind the alternator and steering pump.It also has a
> sensor on the housing.I went through the same thing replacing the green
> sensor,it was not the problem.when i removed the whole housing and took it
> apart i found that the plastic tabs that held the thermostat in place broke
> off which caused the thermostat to remain open.I purchased the whole
> housing,it came with everthing that i needed,it was a little over a $100
> but worth it.replaced it and problem resolved.
>
>

Thanks for this good info. I have just replaced the temp sensor but I
notice that the temp is now only a couple of degrees higher, so it may
indeed be a sticking thermostat.

Some questions:

1) was your only problem a low temperature or did you have other
symptoms that caused you to want to replace the thermostat?

2) did you have to remove more than the undertray to get to the pump, or
did you also have to remove the cowling around the timing belt?

3) were the plastic tabs broken through general wear and age, or did
they get broken as a result of your dismantling job?

4) Can you say more about this sensor on the housing - I cannot see one
in the pics on the Haynes manual, but their material is incomplete as a
matter of course.

Grateful for any additional info you can provide.

Thanks, Robert

Re: A4 1,8 TS coolant temp reads low
 

moparmadman wrote:
> I just ran into the same exact problem on the same application. It was
> the thermostat.I picked up the part at the dealer.If you are not
> mechanically inclined do not attempt to replace it.It has a plastic
> housing and is behind the alternator and steering pump.It also has a
> sensor on the housing.I went through the same thing replacing the green
> sensor,it was not the problem.when i removed the whole housing and took it
> apart i found that the plastic tabs that held the thermostat in place broke
> off which caused the thermostat to remain open.I purchased the whole
> housing,it came with everthing that i needed,it was a little over a $100
> but worth it.replaced it and problem resolved.
>
>

Thanks for this good info. I have just replaced the temp sensor but I
notice that the temp is now only a couple of degrees higher, so it may
indeed be a sticking thermostat.

Some questions:

1) was your only problem a low temperature or did you have other
symptoms that caused you to want to replace the thermostat?

2) did you have to remove more than the undertray to get to the pump, or
did you also have to remove the cowling around the timing belt?

3) were the plastic tabs broken through general wear and age, or did
they get broken as a result of your dismantling job?

4) Can you say more about this sensor on the housing - I cannot see one
in the pics on the Haynes manual, but their material is incomplete as a
matter of course.

Grateful for any additional info you can provide.

Thanks, Robert

Re: A4 1,8 TS coolant temp reads low
 

1.yes low temp was the only problem.
2.the thermostat was not near the pump or the timibelt area,it was
behind the power steering pump.if you follow the lower radiator hose from
the bottom up it leads to the plastic housing that bolts to the
block,inside it is the thermostat.
3.it was wear and age.dont forget the housing is plastic.and gets very
hot and cools down constantly.
4.if you get the thermostat from the dealer the
sensor is on the housing.

hopefully this helps.

Re: A4 1,8 TS coolant temp reads low
 

1.yes low temp was the only problem.
2.the thermostat was not near the pump or the timibelt area,it was
behind the power steering pump.if you follow the lower radiator hose from
the bottom up it leads to the plastic housing that bolts to the
block,inside it is the thermostat.
3.it was wear and age.dont forget the housing is plastic.and gets very
hot and cools down constantly.
4.if you get the thermostat from the dealer the
sensor is on the housing.

hopefully this helps.

Re: A4 1,8 TS coolant temp reads low
 

1.yes low temp was the only problem.
2.the thermostat was not near the pump or the timibelt area,it was
behind the power steering pump.if you follow the lower radiator hose from
the bottom up it leads to the plastic housing that bolts to the
block,inside it is the thermostat.
3.it was wear and age.dont forget the housing is plastic.and gets very
hot and cools down constantly.
4.if you get the thermostat from the dealer the
sensor is on the housing.

hopefully this helps.

Re: A4 1,8 TS coolant temp reads low
 

1.yes low temp was the only problem.
2.the thermostat was not near the pump or the timibelt area,it was
behind the power steering pump.if you follow the lower radiator hose from
the bottom up it leads to the plastic housing that bolts to the
block,inside it is the thermostat.
3.it was wear and age.dont forget the housing is plastic.and gets very
hot and cools down constantly.
4.if you get the thermostat from the dealer the
sensor is on the housing.

hopefully this helps.

Re: A4 1,8 TS coolant temp reads low
 

moparmadman wrote:
> 1.yes low temp was the only problem.
> 2.the thermostat was not near the pump or the timibelt area,it was
> behind the power steering pump.if you follow the lower radiator hose from
> the bottom up it leads to the plastic housing that bolts to the
> block,inside it is the thermostat.
> 3.it was wear and age.dont forget the housing is plastic.and gets very
> hot and cools down constantly.
> 4.if you get the thermostat from the dealer the
> sensor is on the housing.
>
> hopefully this helps.
>

Yes thanks, that's a useful set of answers. I think I'll go buy a
thermostat in the next week or so, and try to make do with the existing
housing.

Cheers, Robert

Re: A4 1,8 TS coolant temp reads low
 

moparmadman wrote:
> 1.yes low temp was the only problem.
> 2.the thermostat was not near the pump or the timibelt area,it was
> behind the power steering pump.if you follow the lower radiator hose from
> the bottom up it leads to the plastic housing that bolts to the
> block,inside it is the thermostat.
> 3.it was wear and age.dont forget the housing is plastic.and gets very
> hot and cools down constantly.
> 4.if you get the thermostat from the dealer the
> sensor is on the housing.
>
> hopefully this helps.
>

Yes thanks, that's a useful set of answers. I think I'll go buy a
thermostat in the next week or so, and try to make do with the existing
housing.

Cheers, Robert

Re: A4 1,8 TS coolant temp reads low
 

moparmadman wrote:
> 1.yes low temp was the only problem.
> 2.the thermostat was not near the pump or the timibelt area,it was
> behind the power steering pump.if you follow the lower radiator hose from
> the bottom up it leads to the plastic housing that bolts to the
> block,inside it is the thermostat.
> 3.it was wear and age.dont forget the housing is plastic.and gets very
> hot and cools down constantly.
> 4.if you get the thermostat from the dealer the
> sensor is on the housing.
>
> hopefully this helps.
>

Yes thanks, that's a useful set of answers. I think I'll go buy a
thermostat in the next week or so, and try to make do with the existing
housing.

Cheers, Robert