Air Conditioning pump/compressor

A

andymcculloch

New member
My ac pump has stopped working, took it into Halfords to get the gas topped up but mechanic said the pump isn't cutting in, is it a big job to replace? DIY?
 
Spray the electric clutch on the front of the pump with wd40 might free it off mine was the same when I got it did that then put a bit of gas in now working fine :thumbsup:
 
Remove the plastic cover at the front of the engine bay, the one with the bmw logo on it. Underneath on the drivers side you'll see the main power connector for the fan. It has two heavy cables and one very thin green one in the middle. My money is on the green one having corroded into dust where it enters the connector. Simply cut back and solder a replacement piece in. I've done a few of these now and ir was a right PIG to diagnose! The green wire is the fan speed input to the ecu, no fan speed = no a.c. clutch engagement signal!

Simples!

Oh and I wouldn't let Halfrauds near my a.c. with their amateur top up kit!!

Mike
 
Hi, thanks for the tips, I'll give these a try, is there a low AC gas pressure sensor that stops the compressor running as well?, not sure I've read this somewhere or not?
 
andymcculloch said:
Hi, thanks for the tips, I'll give these a try, is there a low AC gas pressure sensor that stops the compressor running as well?, not sure I've read this somewhere or not?
Click to expand...

Yes, there is a pressure switch in the system. Does the main fan come on when you turn the AC on?

Mike
 
There will be a low and high pressure switch the low to stop the compressor running and causing damage if it is low on gas and a high to cycle the fan on and off at set pressures is there any gas in the system when you put gauges on it ?
 
An AirCon expert told me that the re-gassing of a system should never be required.

He said if it needs gas, then there's a leak.

Is there any truth in his statement?
 
ronk said:
An AirCon expert told me that the re-gassing of a system should never be required.

He said if it needs gas, then there's a leak.

Is there any truth in his statement?
Click to expand...

That is true it is a sealed system so should not need gassing but the seals dry out if not used regularly but the main problems are holes in the condenser from stones causing small leaks you can get leak stopper to add to the system to stop small leaks and also dye so you can find leaks the gas does not go off like kwik fit used to tell people 🙄
 
I seem to recall seeing a glass inspection eye in a car with a level mark in the aircon system ?
 
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