90 5351 AC Problems - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 10-02-2005, 07:48 PM
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90 5351 AC Problems

I need some help here. My ac will only come on for a minute then turns off, a few minutes later it comes on the same thing. Here is what I have done so far. Replaced dryer, pressure switches, and expansion valve, converted to r134(removed ac compressor and drained the put in 5oz of Pag oil) and replace aux low speed resistor. I vacuum system down for 4 hours and check to see if it holds. Check good. If I supply power to the compressor directly it works fine and cools great. I have check all relay and fuses. Sometime it will stay on for five minutes and cools great. The Bently manual refers to a ac compressor clutch control relay which I cannot find. My car was built 8/90. Any Ideas???

Chris
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#2 (permalink) Old 10-03-2005, 01:45 AM
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This is a tough one. since you have replaced a lot of AC parts and still cannot find the problem, i would take it to a dealer and see what they have to say. i think i remember reading somewhere that there is a setting on the onboard comptuer that can change the amount of time the AC is on for. try resetting it. it should say how to reset the onboard computer in the Bentley manual. when you supply power directly to the compressor, you are bypassing the onboard comptuer.

Also, it could be your battery that is going bad. make sure the output voltage of your battery is correct.
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#3 (permalink) Old 10-03-2005, 11:19 AM
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Could also be a bad temp sensor in the evaporator.
If it's giving a bad reading, it could turn off the AC so it doesn't get any colder. Check those guys.

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#4 (permalink) Old 10-03-2005, 08:29 PM
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Thanks will try checking the evap temp sensor, though I am not looking forward to taking the console and dash apart again. Also just replace battery a few monthe ago. When you say reset the on board computer does that happen when the battery is disconnected? I had the battery disconnected when I change the expansion valve.

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#5 (permalink) Old 10-03-2005, 09:12 PM
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the computer will reset in about 15 - 30 minutes with the battery disconnected, so yes it should have happened already.

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#6 (permalink) Old 10-03-2005, 10:26 PM
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how hard was it to take your dash apart? how long did t take?
i also have AC problems and need to take my dash apart (first time doing this)

anything i got to watch out for? used:
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#7 (permalink) Old 10-04-2005, 09:41 PM
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I wasn't to bad. I used a Bently manual which help. I had to pull the radio, glove box, the shift knob, center console, and panels under the steering wheel. Then there are clips and two screws that hold the evap cover on. It took about a hour.
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#8 (permalink) Old 10-05-2005, 12:16 AM
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This is the ONLY topic where I don't agree with the manual.
NONE of that is necessary to get to the evap / expansion valve. lol
bah. Learned the hard way. haha.

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#9 (permalink) Old 10-05-2005, 08:26 PM
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Your right I didn't have to do that way. I do not consider it learning the hard way though because I was able to clean all the stuff that was behind everything also give the console and all the panels a good cleaning. lol
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#10 (permalink) Old 10-10-2005, 03:12 AM
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Never hurts to give a deep cleaning like that. No good to have good A/C, but to have nice clean are blowing through funky dash or vents.

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#11 (permalink) Old 10-10-2005, 02:50 PM
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Talking AC Fix

I wanted to thank everyone for there ideas. I fix it!! I check the evaperator sensor and it was bad went to the local junk yard and found one on the same year car. I had my mutimeter with me and it check good, so installed and still no A/C. Disconnected the battery and keep it off for hour no luck. So I check the compressor cut off relay located behind the left hand kick panel. I Had power to relay, but change anyway. I was one of those orange relay which are everywhere on the car had a spare and Bingo A/C works

Thanks

Chris
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#12 (permalink) Old 10-10-2005, 05:54 PM
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A little old fashioned troubleshooting. Bimmers are good for teaching that skill, that's for sure.

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#13 (permalink) Old 10-11-2005, 12:58 PM
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Glad to hear you got it working again, Life without A/C is hard sometimes.

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#14 (permalink) Old 10-12-2005, 12:45 AM
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Quote:
Originally Posted by cga
I wanted to thank everyone for there ideas. I fix it!! I check the evaperator sensor and it was bad went to the local junk yard and found one on the same year car. I had my mutimeter with me and it check good, so installed and still no A/C. Disconnected the battery and keep it off for hour no luck. So I check the compressor cut off relay located behind the left hand kick panel. I Had power to relay, but change anyway. I was one of those orange relay which are everywhere on the car had a spare and Bingo A/C works

Thanks

Chris

for the record, instead of disconnecting the battery for an hour, you can jump the pos. & neg. cables together to "reboot" the computers in an E34.

1. disconnect battery cables, first -, then +
2. turn ignition on position II
3. connect both battery cables ("short") for at least 10 minutes for drain of remaining power out of the system
4. ignition off
5. connect battery cables again to battery, first +, then -

all computers will start with their basic programming and will "adapt" from there. credit to "shogun" for the procedure.

^^ ><((({>
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