Quote:
Originally Posted by MW3Designs
I took the old X5 out to pick up a xMas Tree today, and the window was not defrosting, and fogging up while driving. I put my hand in front of the vent cold air. I thought, she must be cold, but after the truck was warm still cold air. I decided to rev the motor while at red light and the air got hot, but back to cold when it was at idle.
As if she doesn’t have enough issues, now I have a new one. Any ideas where I should start? The coolant is full, maybe air in the system? I did change the Water Pump last year, but had heat after that no issues?
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Sounds like air in the system to me. I'd try bleeding the system since it's a free fix if that's it. Which model X5 is this? I've also heard it can be the auxiliary water pump and the heater (water) valves are known to go bad as well - although the latter usually seems to result in no heat at all in one or both front zones.