This will also apply to the 300Tdi so hopefully some of you guys have seen this before.
Last weekend I changed my timing belt, which necessitates draining the coolant if
you take out the grill and radiator like I did.
Since then the temperature gauge has gone about halfway up to what used to be normal when driving and drops off to nothing at idle. I've run the heater and parked on a steep hill
to be sure any bubble towards the heater core and back of the engine would burp out.
Same thing again on test drive. Pretty sure the t-stat is opening cause the upper heater hose has hot coolant in it, as do the heater hoses going back to the heater core.
Looking for ideas? T-stat? Water pump? Something I'm missing?
Thanks in advance.