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Common Leaks on 99 chev Pkup

extramile on Fri August 07, 2009 6:59 PM User is offline

Year: 1999
Make: Chev
Model: Silverado Ext Cab
Engine Size: 305
Refrigerant Type: 134A
Country of Origin: Canada

Got a call to work on a 99 chev pick up. Customer told me he had it filled and it was gone in 3 days. I was in the area and without my stuff but I just took a quick look. Of course, compressor down at the bottom of motor but everything looks dry. Being a Chev I tried to look down at the connections on top of compressor but it looked dry also ( what a weird setup with the 2 roundish rectangular things on compressor lines ). Anyways, where are the common leak areas on these units. Truck is in mint shape and just did a visual on condenser at it looks good. Going back with my nitrogen next week.

GM Tech on Fri August 07, 2009 10:36 PM User is offline

and he knows it is gone because his gage says no pressure?????? I've seen clutch drive air gaps be too wide, belts that are thrown off- not even there, cycling switches bad--- These are pretty good for not leaking-- I'd hook up a gage set to know for sure....

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......

extramile on Sat August 08, 2009 10:28 AM User is offline

For sure I will, just trying to get a little background before I start. Usually I will grap compressor clutch by hand and turn it to make sure it's not seized and make sure belt is on then put gauges on before I diagnose anything.

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