Question about 1996 Chevrolet Express

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Where is the low pressure line AC for Express 1500

I have a 2002 Chevy Express 1500 and need to add freon to the AC, but I can't locate the low pressure line. Anyone helps please! Thank you.

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  • Anonymous Mar 20, 2014

    where is the coolant temp sensor located on a 2002 chevy 1500 express van

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Look for the accumulator(silver can a/c lines go to) on the passenger side of engine area. The Low side charging port cap should be on the side of the accumulator.

Posted on Jun 23, 2009

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2002 Chevy Express 1500. A/C Full of freon, fan blows hot air and not cold at all. What can it be?


check all fuses first. does ac compressor come on? if not, unplug pressure switch in low pressure line near where you add freon and short across pigtail. comes on now and cools? replace switch. if not plug back in. apply manual voltage to ac compressor. comes on and cools? if not compressor or clutch is bad. if it does, check ac relay. that's about all you can do with limited tools in the driveway. if no progress has been made, time to take it to the pros.

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Add freon


You have to locate the low pressure line and connector port. Trace the two lines back to the firewall that come from the compressor. You will find 1 port on each line. They are usually covered by a plastic cap of some type that unscrews. Your refill hose, assuming you have a standard refill can with attached gauge, will only attached to the low pressure side. The two ports are slightly different in size. The low pressure side should be the larger of the two lines you are tracing from the compressor.

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Where are all the ac switches and relays located


Check the low pressure switch,it is on the dryer or on the low side line,the large ac line,this can be the problem,try jumping the two wires that are plugged into the switch.If the freon is low,or out,this switch will not allow the ac compressor to come on.

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Location for adding freon


add freon to low pressure side . low pressure side is large line with small fitting. high pressure line has a large fitting.

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