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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 12-17-2005, 09:44 PM   #1 (permalink)
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Heater ?

There are a few things I don't know anything about on cars, One of those things being the AC and Heating system.

Anyway here is my dilema. My heater previously worked all the time. Now it only works when I am driving over 30mph constantly. If not, it acts as if the vent is on (no hot air). And nothing when I am stopped as well. I know that on certain vehicles the heater and ac are tied together somehow. My ac compressor is disabled (removed belt). Any explanations?
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Old 12-17-2005, 11:09 PM   #2 (permalink)
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Check your coolant level. Low coolant will cause those systems. It could be a heater valve, but I doubt it, check the coolant first.
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Old 12-17-2005, 11:57 PM   #3 (permalink)
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Quote:
Originally Posted by tomctx
Check your coolant level. Low coolant will cause those systems. It could be a heater valve, but I doubt it, check the coolant first.
Tried that bacause I was a tick over normal temp, but it's full.
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Old 12-18-2005, 12:15 AM   #4 (permalink)
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If you have the rotory control turn the driver side full clockwise past the detent to get into the emergency heat mode. If this gives heat your problem is electrical. Don't rule out fuses. If the emergency mode does not yeild heat the problem is either air lock from improper cooling system bleeding or something got dislodged when the thermostat was replaced and is plugging the heater valve. If you have the digital control to similate the test which I mentioned you can disconnect the electricial cable from the heater valve. This will fully open the valve. The valve is on the firewall on the engine side between the brake booster and the engine.

See if this quote helps.
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Old 12-18-2005, 12:37 AM   #5 (permalink)
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Thanks for the info. Very descriptive.
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