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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 06-25-2008, 09:47 PM   #1 (permalink)
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1995 318I A/C question

I have a 318I, that blows only hot air. Here is what I have done - The system charge is good. At 85 degrees ambient, I have 30-40 on the low side 140 - 160 on the high side. The lines are cold to the firewall, and the evap box underneath is cold.

I have replaced the switch panel, the a/c ecu (behind the change holder). This car has manual controls.

The question (s) - when the dials are set to 64, should the heater control valve shut off the flow to the heater cores (it is presently not) and is there some sort of soloniod that opens a door from the evap box to allow the cold air into the cabin? It appears to be a 2 fold problem - is there 1 solution that fixes both?

Thanks,

Shelnick
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Old 06-25-2008, 10:30 PM   #2 (permalink)
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looks like you heater control valve is stuck in "open' position. Easy way to tell is if the heater core hoses/pipes feel hot, then yes... the electric valve has gone bad.

*might wanna check your fuses first, though. ;-) FUSE 31 on the power distribution box, especially :-D

water valve is located beside the brake booster. when powered it should be closed... and should spring open with no power.

manifold reading of your A/C system read normal... so i would start at the heater valve ;-)

let us know...

Last edited by darkhorse737; 06-25-2008 at 10:32 PM.
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Old 06-26-2008, 08:11 PM   #3 (permalink)
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darkhorse737,

A tip of the hat to you my friend!! You were right on. I changed the valve and, cold air!!

I thank you for the great advice, and hope I can return the favor!

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Old 06-26-2008, 08:32 PM   #4 (permalink)
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no probs ;-) always willing to help... :-)
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