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A/C slow to start working.

magnetchief on Wed September 26, 2012 1:05 PM User is offline

Year: 2007
Make: VW
Model: Jetta
Engine Size: 2.5
Refrigerant Type: R134a
Ambient Temp: 90
Country of Origin: United States

Looking for a little advice again
Sorry no refrigerant pressures, gauges loaned out to a friend

Here are my symptoms, My Jetta takes 5-10 mins before the AC starts to work.
I have been taking notes over the past few weeks.
The ambient is in the high 90's during the day, AC refuses to start as I drive off.
After some time, it suddenly cuts in, then I have air coming out of the vents at 40 deg +- 2 deg.
Works fine from then on. If I leave the car for a few hrs, were back to the same situation.
Being on recirc or full vent makes no difference to the time it takes to start up.

My question is does this compressor have some sort of variable control valve that could be sticking?
If so where can I purchase a replacement?
Or, could it be another issue?

Thanks in advance.
Steve



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Once Navy alway Navy

TRB on Wed September 26, 2012 2:38 PM User is offlineView users profile

This compressor does have a control vale. But you need to be sure you have a proper charge level before trying to diagnose the system.

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magnetchief on Wed September 26, 2012 2:52 PM User is offline

I figured I would need to check that out first.
I have accsess the tools, so will evacuate it and recharge with the correct amount of refrigerant this weekend.


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Once Navy alway Navy

mk378 on Wed September 26, 2012 3:29 PM User is offline

If it's a clutch type compressor make sure that it actually engages as soon as you press the button. Compressor engaged but no cold would point toward the control valve. Compressor failing to engage would be the clutch or an electrical problem.

Edited: Wed September 26, 2012 at 3:31 PM by mk378

magnetchief on Wed September 26, 2012 4:17 PM User is offline

Thanks for the tip. Will look into that.


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Once Navy alway Navy

ezautoac on Sat October 06, 2012 9:30 PM User is offline

If I'm not mistaken that model has an electronically controlled variable displacement compressor. Its not only variable displacement but a computer controls the pressure control valve. I worked on an Audi A4 with the exact same symptoms, If you check the charge level and the symptoms still occur ( which is what I came across) check the control unit. ( try playing with the control unit when you first turn on the a/c and it doesn't work. push all the buttons on and off, the econ button on and off ... etc. ) If you find that you are able to turn it on like that you may have a bad control unit.

ezautoac on Sat October 06, 2012 9:51 PM User is offline

If I'm not mistaken that model has an electronically controlled variable displacement compressor. Its not only variable displacement but a computer controls the pressure control valve. I worked on an Audi A4 with the exact same symptoms, If you check the charge level and the symptoms still occur ( which is what I came across) check the control unit. ( try playing with the control unit when you first turn on the a/c and it doesn't work. push all the buttons on and off, the econ button on and off ... etc. ) If you find that you are able to turn it on like that you may have a bad control unit.

ice-n-tropics on Sun October 07, 2012 9:36 AM User is offline

The PXE VW application is hyper sensitive to the very small OEM charge weight spec., therefore cans are undesirable and a accurate charging scale is required.
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Edited: Sun October 07, 2012 at 9:37 AM by ice-n-tropics

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