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A/C Fails

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Hello guys.

Due to the rising of the temperatures here in Italy, I faced a problem with the A/C.

Basically, I start the A/C, after a while, fresh air arrives, but, in heavy traffic, cooling temperature

increases, normally it stays on 90 Deg C, but at this point, the A/C compressor swith off.

Only if, coolant temperature goes slight down, or manually ( not all the time ), I switch off and then on

the cabin fan, the A/C runs normal.

R134 is ok, was recharged on last January.

Any idea?

BR

 

 

 

 

 

 

 

Edited by MORE

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R134 pressure too high. Over pressure switch turns off the compresser I'm guessing...?

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mmm I don't know... Using vag, no fault codes, but I can't check the HVAC because it's a manual A/C, 

and my vag supports only auto A/C.

BR

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If the compressor turns off, then something is disconnecting it. On most vdub cars, there is a fan controller unit, which also has a relay which controls the 12v compressor coil. It could be that?

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I do not know ... actually I thought it was the G65 sensor ...

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Is the compressor turning on and off while the car is stationary? Idling. It should be. Might just need a new overpressure switch.

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Oh my gosh... Can I replace it by myself or is difficult? -_-

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Fortunately the pressure switch on the bulkhead is an easy one you can swap yourself.

If you want to check that is it there is a simple bypass test you can do.

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mmm Do you have a scheme where is it visible, please?

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I don't, but just follow the pipes... :)

 

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Oh... Poor me ... But... Thanks a lot for your support... 

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The sensor on the bulkhead behind the engine is easy to change. Or you can unplug it and see if there's a change. It is usually controlled (on manual ac cars) by the fan controller module.

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IMG_20190305_163455-min.thumb.jpg.d58d448d645a698526ef9a17c390be8c.jpgIMG_20190305_163444-min.thumb.jpg.ef5cf1a56762cccd8378de3055e3cd16.jpg

 

Following the pipes, the only two sensor that I saw are these...

 

 

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Neither.

At the back of the engine bay, possibly hidden by the air box.

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Although you're lhd so Alvaro might have to confirm.

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Silver aluminium pipe.

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That connected to the compressor?

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Hi Guys

Unfortunally the problem is not solved, worst, I checked and another one came out.
Read this sequence, please.
I switched on the engine.

I started the AC, so everything was ok, the fan started to run at 2nd speed, so I turned off AC.

I wait until engine warm up, temperature near to 90°C, I connected the vag and I check those values, intake temp, cooling temp, air cond status.

So, I verify the fan until it start up.

First time it starts up at 98°C, more or less and stop at 84°C.

Well, I verify the same with AC on, temperature increased, after a while AC disconnect the clutch, but at the threeshold (98°C)
nothing happen to the fan, temperature continue to increase.

I disconnect the fan plug, I verify if voltage was present, yes it was.

I connected another time the fan, and immediatly fan running.

I did same operation several times, and I notice that at the threeshold , only "pushing" a while the fan, it starts running.

It seems that, with cold engine, 2nd speed it's ok, but at cold engine, fan has a problem to start by itself.
Any idea, please?

:unsure:


BR

 

 

 

 

 

 

 

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Solution?

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The metal clutch disc slipping? Or the magnetic coil?

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