Heat blows cold then hot ???? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-18-2007, 01:30 AM
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Question Heat blows cold then hot ????

I have an 01' 530i and when I turn on the heat after I see that the car has warmed up, it blows out cold to room temp. Then later on in my drive it will blow out hot to very hot. Then it will go back to cold again. I'm not sure what the problem is. Any ideas?
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#2 (permalink) Old 04-18-2007, 07:13 AM
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You may want to check your coolant. It may be low even though your gauge reads fine.



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#3 (permalink) Old 04-18-2007, 09:22 AM
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May also be your heater water valve or your heater core.



1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.

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#4 (permalink) Old 04-18-2007, 10:10 AM
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Thanks. Do you think there could be an issue with the thermostat?
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#5 (permalink) Old 04-18-2007, 10:17 AM
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lol there is always an issue with the thermostat on the E39, the issue is that it sucks. Could yours be stuck, well yeah, how many miles ago was the last time you replaced it?



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