Member
Long story short, ive been trolling this forum for a bit now as im trying to fix all the issues with this 328i i bought about 2 years ago. Work has me traveling a lot so i work on it when i can. The car runs and drives great but the AC has stopped working and i live in texas and refuse to drive it before i fix the AC.
The AC compressor clutch isnt engaging and the aux fan wont turn on.
Things ive done diagnoses wise are;
1. Checked all fuses having to do with heating and cooling. They're all fine
2. Tested compressor, high speed, low speed relays. They all still work.
3. Pulled power connector from AC compressor and back probed it. Not getting any voltage.
4. Pulled the aux fan switch from radiator and back probed it. Im getting 12v.
5. Jumped aux fan switch. No fan movement.
6. Jumped aux fan switch and back probed AC compressor switch. No voltage.
7. Back probed power connector on bottom of the aux fan. No voltage.
So im at a standstill of what could be the problem, any info or help would be extremely helpful, ive googled the shit out of it and watched all the youtube videos on this hoping one would solve my problem only to be disappointed. Im also no AC expert just trying to no have to pay for my project car to me fixed.
Thank you.
@cblock406
Have you checked the system pressure? Sounds like you have a leak and there isn't enough pressure to engage the compressor.
CBlock
Member
I dont have the proper equipment to be able to check pressure without the compressor clutch engaging unfortunately.
Member
Regaurdless of pressurr, shpuldnt i be getting voltage at the compressor?
Member
Nope. If pressure is too low, or too high, there will be zero voltage to the compressor. You really can't do much diagnosis on A/C without a set of gauges. HF has them for $49. You can test for pressure without the clutch engaged.Originally Posted by Philspils
Member
You can rent an a/c gauge set from O'reilly for around 100 bucks, when you're done with it return it for a full refund.
Member
Sorry, been unable to check this thread lately and havent had time to work on the car. Can a bad compressor cause a high pressure problem on the low pressure line?
Large Member
It's tough to say whats going on without knowing both suction and discharge side pressures but to answer your question simply, and assuming you only have a low pressure gauge from a can, a compressor that no longer compresses (internal compressor failure) may not cause a drop in pressure on the low side, making it seem as though the low side is too high (around 75-95psi probably). Really need to know what the pressures are of the static system, and then both sides once the compressor engages.
My initial thoughts of your problem is either you are low on refrigerant, or you have a bad pressure switch.
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