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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 04-22-2010, 11:01 PM   #1 (permalink)
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A/C & Heater blower issues - help

Hey guys. I have a 97 328i, 5spd, 155k miles.

I have searched. But could not find a definite answer.

So my heater and ac doesnt blow very hard. It blows when im driving. According to other posts, its the heater core valve?

Also, another thing. I have a newer (March '09) waterpump, thermostat, housing. when the car is turned on, and the coolant resovoir cap is off, there is no circulation of coolant at idle or lower rpms. Circulation of coolant happens at higher rpms.

In the other posts, people suggested putting in new water pumps, but mine is new. (no overheating issues or anything). i also put in a new cabin filter

since i know this issue of no circulation of coolant, im assuming thats why i have no ac/heater unless im driving.

What do you guys think?

i really need opinions/suggestions.
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Old 04-22-2010, 11:38 PM   #2 (permalink)
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On the climate system, what's the condition of the in dash fan?
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Old 04-22-2010, 11:58 PM   #3 (permalink)
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2 common issues with the E36 fan speed are: a faulty blower resistor, but when this usually goes, the fan speed is stuck on high. If you have digital climate control, it is called the final stage unit, see in link below:

Fixing BMW E36 Blower Fan Speed . . . DIY! | BMW E36 Blog

next, another common issue is the Climate Control Unit itself:

Bmw Climate Control Repair E36


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