Need some AC assistance

Need some AC assistance

Postby markmitch [OP] » June 28th 2020, 1:49am

I know this is not on an Astro but I need to figure out if this is something I can repair or not.
2000 silverado 5.3-V8. AC worked when we first got it but every spring we had to add some R134a to it and last summer I added again and it stopped working all together. So I guess that means it is leaking right? But last year when I tried to add some as soon as I turned the can on it went to the red on the dial which means it is fully charged yet it only blows hot air. So is there anyone here that can tell what to do next? Do I need to replace something. SOrry about all the questions but I am from Maine and never dealt much with AC but now that I live in California I kinda need it fixed. Thanks for your help, Mark
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Re: Need some AC assistance

Postby albrow100 » June 28th 2020, 3:08am

Does the compressor kick on? Does the low side line get cool
And the high side hot?
Swap a/c relays with another similar one in the relay panel

Just a few starting points
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Re: Need some AC assistance

Postby markmitch [OP] » June 28th 2020, 3:56am

ok I will check these things tomorrow
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Re: Need some AC assistance

Postby 97cargocrawler » June 28th 2020, 4:56am

AC clutch cycle switch, screws onto the big silver filter can. That's where I usually start.

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Re: Need some AC assistance

Postby markmitch [OP] » June 28th 2020, 5:35am

Thanks CC
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Re: Need some AC assistance

Postby Leeann_93 » June 28th 2020, 3:14pm

^^ yep. Pull the connector, jumper the contacts with a paperclip or lacing wire. If the clutch engages, your switch is bad. Good news is, there's a seal behind it so you can R&R without losing refrigerant.
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Re: Need some AC assistance

Postby AstrofarianAstrofarian is online! » June 28th 2020, 3:30pm

Leeann_93 wrote:^^ yep. Pull the connector, jumper the contacts with a paperclip or lacing wire. If the clutch engages, your switch is bad. Good news is, there's a seal behind it so you can R&R without losing refrigerant.


DAMN, learned something new today...and I wasn't even TRYING! Thanks Leeann, I've only swapped out 2 of those switches but always when the system was open for something else...nice to know I don't need to drive with a jumper-wired A/C anymore lol.
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Re: Need some AC assistance

Postby Sailing_FaithSailing_Faith is online! » June 28th 2020, 5:07pm

As for the leak, take a look at this... https://www.astrosafari.com/viewtopic.php?f=34&t=140264
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Re: Need some AC assistance

Postby Leeann_93 » June 28th 2020, 5:10pm

Astrofarian wrote:
Leeann_93 wrote:^^ yep. Pull the connector, jumper the contacts with a paperclip or lacing wire. If the clutch engages, your switch is bad. Good news is, there's a seal behind it so you can R&R without losing refrigerant.


DAMN, learned something new today...and I wasn't even TRYING! Thanks Leeann, I've only swapped out 2 of those switches but always when the system was open for something else...nice to know I don't need to drive with a jumper-wired A/C anymore lol.
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Learned it on my Bravada. Since my husband is an HVAC master, we were prepared to evacuate, pull a vacuum and refill...but the FSM said I didn't have to. I unscrewed it as fast as I could. When the sensor was loose, it popped out with a teeny little hiss, but that was it. When the same switch went bad on my husband's cousin's Liberty last year, I double-checked the FSM and it was the same deal.
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Re: Need some AC assistance

Postby markmitch [OP] » July 6th 2020, 6:12pm

OK sorry it took so long but I have been busy and forgot, the ac compressor does not come on at all when the inside switch is turned on. what should I check next? Thanks Mark
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Re: Need some AC assistance

Postby Old Barney » July 6th 2020, 7:15pm

On my 1999 Silverado I learned hot water flows through the heater assy all the time. There is a BLEND motor that directs the air from the blower either to the heater core OR the AC evaporator. As most people I talked with told me the motor is fried. So I got a new blend motor and installed it and the control worked backwards turn the knob to heat and I got cold air turn it to AC and the heater worked. This last month the BLEND motor quit again (cheap plastic gears inside stripped again) SO now i am working on a MANUAL set up like in the 1950's that still work with an cable and lever control for the BLEND air diverter vain thing will work for my comfort. In my younger days driving vehicles up the 1990's were mostly cable control then came along vacuum control then computer control. Yes I'm OLD but things worked back then. we had water flow valves that would shut off the water to the heater core for summer driving and the AC worked very well. Controlled by a cable and a lever on a valve. Positive mechanical movement. Sorry for my rant
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Re: Need some AC assistance

Postby Leeann_93 » July 6th 2020, 10:56pm

markmitch wrote:OK sorry it took so long but I have been busy and forgot, the ac compressor does not come on at all when the inside switch is turned on. what should I check next? Thanks Mark


What I said to do. Pull the connector from the switch on the accumulator. Put a paperclip or small piece of lacing wire from contact to contact, jumpering the connector. Now does the compressor run when the van is running and the switch inside is turned on?
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Re: Need some AC assistance

Postby markmitch [OP] » July 7th 2020, 2:13pm

OK Thanks
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