Temperature question

ekkoh99

Veteran Member
Joined
Oct 24, 2001
Location
Wilmette, il
TDI
2005 passat WGN TDI
I had a thermostat and coolant temp sensor replaced a few years at the dealer. Im reading the normal coolant temperature should be around 90 C. mine is running 92 to 94 (VCDS). Any thought? did a 92 degree thermostat get placed?
 

jetlagmech

Veteran Member
Joined
Oct 1, 2009
Location
Puyallup, WA
TDI
2010 jetta
I would think 2 - 4 degrees would be within acceptable limits on a thermostat, or on a temp sensor. How would you know which one is off. maybe they are both off just 1 - 2 degrees.
 

Tom in PT

Veteran Member
Joined
Jun 7, 2017
Location
Twilight Zone, WA State
TDI
2005 Passat sedan - SOLD; 2013 Passat DSG; both purchased new
Agreed. Run the engine hard on the freeway and watch the temps - if under say 95C you have nothing to worry about. There are very few posts about cooling system problems with the BHW. I never see any hot readings even climbing 7 percent grades out here in WA state.
 

ekkoh99

Veteran Member
Joined
Oct 24, 2001
Location
Wilmette, il
TDI
2005 passat WGN TDI
OK thanks. I remember reading somewhere the thermostat should open at 88C and temp should stay at around.90. Im about 30k from having a timing belt/water pump changed. I had a camshaft, lifters and bearing replaced recently.
Ill keep an eye on it.
 

Vince Waldon

Top Post Dawg
Joined
Apr 25, 2009
Location
Edmonton AB Canada
TDI
2001 ALH Jetta, 2005 BEW Wagon
Yup, they are not a precision instrument and can vary a degree or two. "Around 90" is the key phrase... looks like you're good. :)

I've seen anywhere from 88C to 91C over the years after an OEM t-stat replacement... and some of them are dead solid, others allow a degree or two of drift during normal operation.

One reason why the dash gauge is heavily damped.
 
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