Another Thermostat Q.

G

G-rocco

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Joined Sep 11, 2004

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Discussion starter · #1 · Feb 20, 2007

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I searched; didn't *quite* find the answer I think I'm looking for.
91 Jeta 8v, 207k miles. It got a new T-stat last winter when I got it (heatercore had blown and it wouldn't generate any heat)
It ran great over the summer - cold a/c, not overheating.
Once fall got here the MPG dropped and the needle rarely moves out of the white 'cold' zone. It will move to the halfway point if I'm in a lot of stop and go driving.
Do T-stats fail with regularity? Should I just go ahead and change it?
TIA

 

V

VegasJetta

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Joined Jan 26, 2003

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39,312 Posts

#2 · Feb 20, 2007

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Re: Another Thermostat Q. (G-rocco)

I would change it, if the needle doesn't move, that means its stuck open, and the car isn't getting up to proper temp to run correctly. The CTS wont tell the ECU to adjust the O2 sensor, and it will run very poorly.

 

G

G-rocco

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13,253 Posts

Discussion starter · #3 · Feb 20, 2007

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I'm looking at prices; seems silly not to change it for the $10 bucks a new T-stat is.
To clarify, it's not that the needle dosen't move, it just doesn' move much! I suppose it's all the same symptoms of a stuck open 'stat.
I'm looking here
http://worldimpex.com/search_b...0&y=0
Got a reccomendation which temp T-stat to get?
Thanks http://****************.com/smile/emthup.gif

 

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RandomDubber

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Joined Dec 13, 2006

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#4 · Feb 20, 2007

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get a oem one, 86f or somthing i believe, i bought a aftermarket one that opens at 182f and its **** cause the car overheats, now i have to cahnge it again

 

D

Death Trap

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Joined Feb 14, 2006

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#5 · Feb 20, 2007

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Re: (RandomDubber)

Try changing the coolant temp sensor.