Quote:
Originally Posted by g300d
Update...temps are starting to peak at up to 99 degs in stop and go traffic, and getting harder to get temps down.
I took a look at the heater valve and it is stuck closed with the rubber deteriorating.
Bypassed it by connecting the heater valve supply hose with the heater core return hose with a barbed connector. Temps still reach 99degs peak but it goes down to 86 and back up to 96-99, which is better than before. Still wondering what causes peak temps to increase like that.
Rad outlet temp is ok which is probably why my electric fan does not engage. Ktemp is from the cyl head sensor...with rad temps ok but head temps sometimes high, I'm thinking that maybe a flow restriction is the problem?
It being a periodic problem makes me think it may be a soft failing thermostat that is reluctant to open. But I've never seen any mention of this happening on M54's. All the thermostat problems seem to be being stuck open and temps being too low.
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I wouldn't worry about an increase from 92 to 95c. That's not much and it may not be enough to turn the fan to high. Since you changed the water pump I suggest bleeding the system again with the heater on max. You may still have some air in the cooling system.