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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 01-03-2015, 07:52 PM   #1
330IROC
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Talking Heater Cold then hot

I have an issue with the heater in my 02 Bmw 330I. When the heat is on and the vent is set at the three red dots. At first the air gets really hot and then after a little drive it cools down then gets hot again. I read about the heater valve. I just knew this was it. I bought one in stalled it and I thought it was fixed. Nope still the same. I unplugged the valve and the heat gets really hot. I bleed the lines by putting the car on ramps. Opening the bleeder screw and I think I have let all the air out? Drove it for about 5 miles and at first it was really hot but went back to cool air. I really need to know a good procedure From star to finish. I called the local BMW shop and of course the can't diagnose it over the phone and I will have to pay $120 to check it out. I appreciate the help in advanced.
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Old 01-04-2015, 11:52 AM   #2
djantlive
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Could also be the climate control panel. The electronics are prone to failure. Also, is the exterior temp sensor reading temp alright? The coolant temp sensor could also be bad. These three are often the culprits rather than hcv
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Old 01-04-2015, 12:22 PM   #3
330IROC
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I'm not sure. How can I check these sensors. Thanks
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Old 01-04-2015, 12:34 PM   #4
wallofgrath
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Did you make sure your coolant is full?
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Old 01-04-2015, 01:21 PM   #5
330IROC
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Yes it is full. I bled it three times thinking it may have an air pocket.
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Old 01-05-2015, 01:05 PM   #6
330IROC
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Here is what I have found. The Heater/ Evaporator temperature sensor located in the heater core box is the issue. I unplugged it while the heat was on full at 91 degrees and sure enough the heat was continuous and it was what I have been missing. I ordered another one from the local Bmw store at 32.00 and it should be here tomorrow. If any has any question I will be willing to help! Thanks.
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Old 01-06-2015, 01:55 AM   #7
djantlive
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Good luck. A used climate control panel us on the forum for $45.
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