The dreaded heating issues are back and with full force
Its the coldest part of the year for us (never is as cold as it is now)
With ac off running car for about 40 mins temperature shoots up above 75 percent.
Stays there for a while, drops back a little and then shoots back again
Once the ac is on as the high speed fan comes on full time it drops to less then half
which is normal with ac
Funny part is that once the ac is switched on, even if its switched off high speed fan stays on permanently. Switches off after driving for another 40 to 50 mins in city (stop and go traffic)
This behaviour confuses me
First of all, I have to check if fan is going to high speed to bring engine temperature down
After that’s known, what can be the likely culprit here?
Thermostat, water pump or something else?