Air Con Not Working.

Wetdogleader · Dec 1, 2023

Hi, 2005 4.4 V8 Petrol .
I have had the mechanic change the compressor for a new one, (twice because we believed the replacement was faulty). It has been re-gassed and holds a vacuum, so no leaks. Apparently when the pump cuts in it starts to pressurize and then stops. Pressure sensor was changed but still doing the same thing. Has anybody come across this before?

Mark Piercy · Dec 1, 2023

Over dosing of oil,
Blocked jammed expansion valve,
Blocked evaporator in dash,
Debris in front of the condenser rad,
Main engine fan not working in accordance to the aircon
The readings on the gauges for the aircon machine should give some indication of where to start looking

backinblack · Dec 1, 2023

is it losing the pressure it does build up?

I still don't see the logic of using a vacuum to test a pressurised system. Shirley a vacuum has the potential to suck joints together that would push apart under pressure?

pwood999 · Dec 1, 2023

backinblack said:
is it losing the pressure it does build up?

I still don't see the logic of using a vacuum to test a pressurised system. Shirley a vacuum has the potential to suck joints together that would push apart under pressure?

Agreed. It's a good indicator, but cannot beat a nitrogen pressure check.

I've used compressed air in the past which made finding condenser leak easy, but that required extended vacuum pull to clear the system afterwards.

Currently my compressor has a leak around the shaft where the clutch attaches. Only found it after a re-gas, and later checking why the clutch was noisy !! Replacement compressor (with staff discount) waiting for me in Bedford Euros.

nigelbb · Dec 2, 2023

You will be better off using a specialist vehicle A/C firm than your local mechanic when it comes to fixing A/C problems.

Datatek · Dec 2, 2023

nigelbb said:
You will be better off using a specialist vehicle A/C firm than your local mechanic when it comes to fixing A/C problems.

Even better to DIY

Air Con Not Working.

Wetdogleader

New Member

Mark Piercy

Well fumbled member....

backinblack

Well-Known Member

pwood999

Well-Known Member

nigelbb

Well-Known Member

Datatek

Well-Known Member

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