A/C relay weakening
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Joined: Nov 2013
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From: western NC, USA
A/C relay weakening
So, I took a short trip today in my '08 C-6 base and a/c worked fine as usual. Was parked for an hour or so and restarted car. A/C not cooling at all. Made another stop of about 10 minutes and turned car off. Restarted and A/C is working fine again. I really don't think it's a fuse contact problem. I think it could be either the A/C relay is starting to fail or refrigerant is getting low. I don't think the refrigerant being low is likely since it blew cold air as always, but I think the coil in the A/C compressor relay could be starting to weaken. Is there a way to load-test electrical relays to see if they are working up to par? I could do a continuity test on the relay but I don't think that's going to show anything if the A/C is once again working okay. Just thought I'd do a little preemptive work so it doesn't fail on a trip and require me to shop for a new relay or some other component. What do you think?
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Would bank that it's not a wiring/relay/electrical problem but instead with the system off, the heat exchange not cooling the freon back down, and it was the high pressure switch that kicked the system off/prevented it from coming back on instead.
Hence system has a high pressure switch in it to monitor the expanding Freon charge/pressure as it warms up, so the high side pressure does not get to the point that is blows the lines.
So would have the system pressures checked, since if the system is filled up a little too much/too much pressure to start with, it will cause the system to kick off when the pressure gets too great from the Freon heating up instead.
Hell, could be that the in line accumulator/ filter is clogged to hell, and cause the over pressure problem isntead. And yes, checking the high and low side pressures will tell you if the accumulator/ filter is clogged as well.
Hence system has a high pressure switch in it to monitor the expanding Freon charge/pressure as it warms up, so the high side pressure does not get to the point that is blows the lines.
So would have the system pressures checked, since if the system is filled up a little too much/too much pressure to start with, it will cause the system to kick off when the pressure gets too great from the Freon heating up instead.
Hell, could be that the in line accumulator/ filter is clogged to hell, and cause the over pressure problem isntead. And yes, checking the high and low side pressures will tell you if the accumulator/ filter is clogged as well.
Last edited by Dano523; Jul 17, 2018 at 01:08 PM.
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