A/C Relay

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Jan 13, 2003 | 10:04 PM

mlkull

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A/C Relay

How do you test a relay to see if it's good? I think my A/C Relay is the reason why my A/C isn't working, but I don't know of a way to test the relay. Can it be done with a voltmeter measuring for resistance?

Jan 14, 2003 | 05:23 AM

ranger pat

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From: Elk River, MN

A/C Relay

Swap it with one of the other relays for wipers, fog lamps, etc and see if that makes the a/c work. The a/c relay is only for the a/c diode on the compressor.

Jan 14, 2003 | 05:42 AM

mathelm

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From: W-S

A/C Relay

As in Air Condition? The only relay I know of is on the coolent tank. And that one you use a paper clip to jump or short it to engage the A/C clutch.

Jan 14, 2003 | 09:06 AM

mlkull

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A/C Relay

So a relay is a relay is a relay? It doesn't matter which one goes where?

Jan 15, 2003 | 07:56 AM

Ken00

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From: South Jersey

A/C Relay

Relays can be different but in most cases they are similar, depends on the year also. The AC has a pressure switch that can be jumped for a short period to see if you have a low charge/bad swtich and a WOT relay that cuts out the AC for WOT.

Jan 15, 2003 | 09:40 AM

mlkull

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A/C Relay

I found the WOT relay. I replaced it with another relay which I knew was working. The clutch didn't kick in. So I know it's not the relay. Where is the pressure switch you're talking about? I'll try that next.

Jan 15, 2003 | 01:38 PM

mathelm

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From: W-S

A/C Relay

On the coolant tank....

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Jan 15, 2003 | 07:43 PM

Ken00

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Joined: Dec 2001

Posts: 10,562

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From: South Jersey

A/C Relay

It's normally near the firewall, I'm drawing a blank on the components name right now. Don't run it long when you jump it or you will damage the compressor. This mormally means you need a charge.