'02 A4 1.8T - thermostate diagnostic help
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1st Gear
Joined: Nov 2007
Posts: 50
'02 A4 1.8T - thermostate diagnostic help
temp guage stays at C for long period of time, then rises to 1/4 and heater works. I suspect thermostat, anything else I need to check before replacing...Replaced temp sensor, problem still exists;
thanks,
note that I changed out timing belt 5 K miles ago...
thanks,
note that I changed out timing belt 5 K miles ago...
Last edited by pmkcolorado; Nov 8, 2008 at 06:33 PM.
Senior Member
Joined: May 2006
Posts: 491
From:
Yea, the ECT (engine coolant temparture) sensor is cheap (<$10 from dealership) and is the first thing to do. I assume that's what you did when you say temp sensor.
As for the thermostat, it would have been easier to do with the TB but it's not necessary. I was going to do it when I did my TB 5k miles ago too but read that it's a fairly easy change and people recommended it be done when it goes rather than preemptively due to it's high cost (not just the t-stat but the housing as well).
I can't think of anything else for you to check before doing this, sorry.
As for the thermostat, it would have been easier to do with the TB but it's not necessary. I was going to do it when I did my TB 5k miles ago too but read that it's a fairly easy change and people recommended it be done when it goes rather than preemptively due to it's high cost (not just the t-stat but the housing as well).
I can't think of anything else for you to check before doing this, sorry.
2nd Gear
Joined: Mar 2007
Posts: 1,181
From: Richardson, TX
the 02 thermostat is no where near the timing belt so it really doesnt help to do it with the TB. the thermostat is below the throttle body and kind of behind the alternator. I just replaced mine about 2 months ago. There was no option for me to just replace the housing or sensor or anything, it was all one part. I got mine from aboveallmotorwerks.com and it was like $77 for the oem part.
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Joined: Feb 2007
Posts: 9,004
From: Nor Cal
the 02 thermostat is no where near the timing belt so it really doesnt help to do it with the TB. the thermostat is below the throttle body and kind of behind the alternator. I just replaced mine about 2 months ago. There was no option for me to just replace the housing or sensor or anything, it was all one part. I got mine from aboveallmotorwerks.com and it was like $77 for the oem part.
2nd Gear
Joined: Mar 2007
Posts: 1,181
From: Richardson, TX
heres a link to the part i ordered and installed. http://www.aboveallmotorwerks.com/Pr...121111K_S.aspx
my car is def an 02 b6! bought it from a dealer as a cpo
my car is def an 02 b6! bought it from a dealer as a cpo
Thread Starter
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1st Gear
Joined: Nov 2007
Posts: 50
it would help if I could spell "thermostat" when searching...Shane is right as the thermostat is behind the alternator, not part of the timing belt replacement proceedure, and is not servicable. You need to replace the entire housing...