AC troubleshoot R134-A

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Elko81_4130

n00b
Jun 26, 2020
2
1
81 El camino with updated ( within the last couple years) R134-a system. Stopped working at the end of last summer of 2019.
Just getting around to trying to trouble shoot it and I'm coming across a few problems and not sure where to start in order to trouble shoot.

First thing is the AC system stopped blowing completely. I took the Blower motor out to look at it and see what condition it was in. When I put it back in - it started blowing again.
Second thing is the compressor clutch stopped engaging. And this is where I am now.

What I've done to try to fix it -
1- replaced the blower motor relay
2- replaced the entire compressor and clutch ( added oil after evacuating system)
3- I found a rotten connection - I cut the connection out and hardwired the wires
4- I was having trouble refilling the freon into the lower pressure point so I replaced the adaptor to no avail - The system still will not take any Freon from the can - I'm wondering if this is because the system won't turn on, there is no air flowing anywhere.

Any advice or a next step would be appreciated. Thanks
 
Turbo Zach

Turbo Zach

Royal Smart Person
Sep 8, 2015
1,980
113
50130
First thing would be to get the blower motor working. If it worked and now stopped? It may be a bad motor. If you don't have the equipment to work on the A/C system? It probably would be cheaper to have someone charge it that knows how it works. If the clutch does not engage? It could be a few things. Bad wiring? Bad head unit switch? Bad low pressure switch? Evacuate the system, and put some freon in. After one can the clutch should engage. If it doesn't? Try putting a jumper wire in the plug of the low pressure switch on the dryer.
 
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Elko81_4130

n00b
Jun 26, 2020
2
1
Ok cool, Thanks.
I put in a new Blower Motor this morning. Still not blowing anything. When I turn the dash switch to "on" either "hi or low air" I can hear something happening but no air.
I tried to add freon again with the new blower motor but the system won't take the air from the canister.
Any ideas? Thanks
 
Ribbedroof

Ribbedroof

Comic Book Super Hero
Supporting Member
Jan 4, 2009
3,514
113
Wellston, OK
Did you pull a vacuum on the system after replacing the compressor?

If you are using the compressor to pull the refrigerant in, you'll have to jumper the pressure switch to make the compressor run.

It would be best to have someone with a refrigerant charging station do it, but I get wanting to do it yourself.
 
airboatgreg

airboatgreg

Royal Smart Person
Oct 2, 2016
1,944
113
Does the blower work on speeds 2 or 3?
Find the high blower relay and do you have current on the big red wire?
Is there R134a in the system?
Is the compressor engaging?
 
Mac442

Mac442

Apprentice
Apr 25, 2020
82
33
Ocean County, NJ
How did you evacuate the system? Do you have a set of gauges and a vacuum pump? Very important to pull and hold vacuum or you are wasting your time.

You said it making a noise when you switch the blower on but nothing happens: if high isn’t working and the lower settings it may be a problem with your dash unit switch. Pull it out and check to see if everything looks ok. Also look for brittle vacuum hoses while you are at it.
 

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