Question about 2000 Chevrolet Silverado

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Hello I have a 2000 Silverado and am having an issue with the AC blowing hot. I jumped the pressure switch and the clutch engages. I believe that the pressure is low but trying to find out do I test the pressure with the AC running? I have gauges but not sure what is the proper way to check. Does the clutch need to be running.... as it will kick on and then kick off in about 10 sec. If I jump it it runs continuously and there will be frost on either side of the Low pressure port. Also I replaced the pressure clutch switch.

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Hook up manifold and open port valve (at hook up ends
make sure that manifold valve hi is shut open low side only
start engine switch a/c on max and blower motor to high and read pressures
its sounds like system is low (may have small leak) try to located with snifer
look for oily residue around conection or condensor(front a/c rad)
if you can locate have system evacuated to removed remaining freon
repair area if you can not locate leak have it evacuated and then charged
with nitrogen gas to 150 psi do not run system with nitrogen use soap and water
and spray entire system to locate leak will show up has bubbles repair and retest
if o.k. drain out nitrogen gas and vacum sytem to draw out any moisture if any major
component were change oil will need to be added to system they now have a flurecent dye
that could be added to system that will glow with black light next time system leaks
if it holds pressure and vacum you can recharged
some leaks are hard to find
just jumping the low presure switch for to long with system low will cause compresor failure
now if pressur all seems find low pressure switch could be faulty easy repair remove and replace
do not need to empty system

Posted on Apr 04, 2011

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Sounds like your pressure is ok, The clutch will kick on and off when low on frezon, If system is frosting up your just using presure to push any coolent through the lines. I would say you need to try adding about 2 can's of the frezon required for your system. Then recheck, Good luck to you.

Posted on Apr 04, 2011

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You can get a pressure gauge from a local autoparts store. it is also a tool to add freon to your system.

Posted on Apr 04, 2011

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