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  #1  
Old 12-01-2019, 03:53 PM
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Heat only when RPMs are up

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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  #2  
Old 12-02-2019, 12:45 PM
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Quote:
Originally Posted by MW3Designs View Post
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.
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Old 12-02-2019, 03:37 PM
ard ard is offline
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Originally Posted by Cyrix2k View Post
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.

my guess as well. Could have failed slightly open?
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Old 12-02-2019, 07:15 PM
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Sometimes I don't get what I feel is adequate heat at highway speeds/RPM. It seems to be (more of?) an issue since the solar windshield was fitted and couple of years ago and when it's sunny out. Like the solar sensor needs to be recalibrated or a new curve programmed. Sometimes I have to turn the temperature up to 28C - I have four zone auto climate control - to get any heat. I feel like the hysteresis adjustment (which is electronically controlled with the climate control option) has to ne relied up on way too much in my X5.
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Last edited by josiahg52; 12-02-2019 at 07:22 PM.
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