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.
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......
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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