Good evening everyone,

I have the following question about my air conditioning system.
I had the air conditioning service done at a garage today. The air conditioning system was refilled. All good so far. But it still doesn't work perfectly.
The mechanic found that the compressor is constantly switching itself off and on again - i.e. not constantly - hence the lack of cooling. Further investigations are necessary...

What could it be? Does anyone know the problem? Thanks!
What year is your car? On later cars, there is a relay that operates the compressor clutch, it's relay 3, a smaller relay than the others, that would be my first thing to check. If it's an early car, the problem could be the HEVAC.
It could also be the dual pressure switch.
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1380g R134a - they had a very professional device for this - they did a good job! If I understood everything correctly, everything was drained and then refilled. it took about 45 minutes...

I have a sticker on the front - everything is specified there.

I have the Range with Bosch...

the air conditioning is already cool, but not really cold. That's probably because the compressor doesn't run continuously.... that was the statement....
 
I thought thats how it worked? On to raise pressure of the refridgerant, then off until the pressue drops again with use of refridgerant, then on again. The compressor doesn't run constantly with normal use I didn't think? I often hear mine click in and out when the engine is just ticking over when waiting in traffic for instance....
 
I thought thats how it worked? On to raise pressure of the refridgerant, then off until the pressue drops again with use of refridgerant, then on again. The compressor doesn't run constantly with normal use I didn't think? I often hear mine click in and out when the engine is just ticking over when waiting in traffic for instance....
Spot on young man
 
...of course that could be true, I can't judge whether the guys had a clue about the range...
Could also be a blend motor problem if it's not getting cold. The aircon on the P38 is functionally no different to most other cars of the same vintage, no specific P38 knowledge needed when filling apart from the type and amount of gas.
 
Get a thermometer on the high & low side pipe & compare the temperature.

FYI, my little Merc C180 Coupe wasn't getting cold at idle, so checked the pressures at idle & 2500rpm. All looked ok, but the vents weren't as cold as expected. Then I jet-washed the condenser & cleared out loads of debris. Now it's nice & cold even at idle.
 

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