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system wont take charge

radracer200 on Tue June 10, 2008 2:11 PM User is offline

Year: 2002
Make: chevy
Model: suburban
Engine Size: 6.0
Refrigerant Type: 134a
Ambient Temp: 84
Pressure Low: 30
Pressure High: 20
Country of Origin: United States

replaced compressor,accumalator,orfice tube, flushed, pulled long deep vac on both sides. applied charge to low side takes about 8 ozs. and thats it. checked for restrictions. tried again with same outcome. pressures have been all over on both sides. low end up 20 to 30 high is at bottom

GM Tech on Tue June 10, 2008 2:25 PM User is offline

Something is wrong with your charging method- the can alone at room temp should be 80 psi or so-- then if it is attched properly to the vehicle with all valves open- the pressure shoud equalize between the two--so either your can is now empty-- (load another one)- or your valves are not opened correctly- the compressor will kick on at 47 psi or so......

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

radracer200 on Tue June 10, 2008 3:07 PM User is offline

iam a novice at this, but let me ask some more questions. is it safe to send the charge down both sides....both valves open on the manifold during this procedure. my past experince was to introduce the refridgerant on the cold side.

GM Tech on Tue June 10, 2008 3:36 PM User is offline

You can only suck it in on the low side (cold) side- it is not safe to have the high side open- otherwise you will be pumping in a circle through your gage set- and have equal pressures- just like you have described.......open only the low side valve (blue)

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

radracer200 on Tue June 10, 2008 4:11 PM User is offline

well thats what i thought low side only. certainly is strange.system had a noisy clutch and custumer requested to replace the parts i mentioned. seems like it should take the charge after pulling system down but it doesnt. wonder if i got a bad compressor. all parts were oem

Chick on Tue June 10, 2008 5:44 PM User is offlineView users profile

have to ask, you do have the motor running and ac on?? otherwise a GM tech stated, the can has more pressure than the system appears to have..You did let the vacuum pull in as much as it could be fore starting the car right? And the clutch is engaged while you're trying to start it?? If the compressor is not coming on, it won't pull any in..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

radracer200 on Wed June 11, 2008 1:08 AM User is offline

the motor is on, the ac is on high for the front and rear system. ive pulled a long deep vac. the clutch is engaged and the compressor is spinning

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