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Thread: A/C cutout relay?

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    Member ZombieTown94's Avatar
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    Default A/C cutout relay?

    Ok, so here is my problem. Something has been draining my battery lately. Within 2 days it dies, from a full charge. Battery is new, alternator is new. I have used a voltmeter across the negative battery cable and the negative battery post, while pulling fuses and the number varied only slightly between fuses. I then got to this box (pictured). There are 3 relays in there. I noticed the "A/C CUTOUT RELAY" relay was quite warm to the touch. Once I pulled it, the number on the voltmeter dropped significantly. What is this relay for? What's it do? This dead battery thing is driving me nuts, and I think this may be the culprit. Click image for larger version. 

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    -1994 Lincoln Town Car...KYB Gas-a-Just shocks, tint, 16 inch CVPI steelies, BFG Tires, poly sway bar links...more to come..

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    Fastest Box In South Jersey 86VickyLX's Avatar
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    Relay turns off a/c at high loads/ wide open throttle/ start up. This would only be powered and grounded when the key would be turned on.
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    Member ZombieTown94's Avatar
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    Quote Originally Posted by 86VickyLX View Post
    Relay turns off a/c at high loads/ wide open throttle/ start up. This would only be powered and grounded when the key would be turned on.
    Any idea why it would be warm, almost hot?

    -1994 Lincoln Town Car...KYB Gas-a-Just shocks, tint, 16 inch CVPI steelies, BFG Tires, poly sway bar links...more to come..

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    Beater gonna beat sly's Avatar
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    If the ECC relay isn't turning off, that could be why. It provides the power for the rest of the relays in the car (coil side). The WOT relay is the only one that's normally closed though. This may also indicate that the ECM isn't shutting down all the way either... which may indicate other issues may be at work as well like a shorted ignition switch. Easy way to test is to swap the ECC and fuel pump relays and see if the fuel pump stays running with the key on, engine off. May just need to replace those relays.

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    Member ZombieTown94's Avatar
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    Hmm, I have multiple extra relays around so I did replace the 3 in there. We'll see if that changes anything

    -1994 Lincoln Town Car...KYB Gas-a-Just shocks, tint, 16 inch CVPI steelies, BFG Tires, poly sway bar links...more to come..

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    Beater gonna beat sly's Avatar
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    If not... I'd place my bets on a short in the ignition switch or some wiring between the relays and the switch (which would be a bitch to trace).

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
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    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

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    Member ZombieTown94's Avatar
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    Quote Originally Posted by sly View Post
    If not... I'd place my bets on a short in the ignition switch or some wiring between the relays and the switch (which would be a bitch to trace).
    No thank you! Haha

    Anyway, replaced the relays and the car hasn't been touched since then. Just tried and it fired right up, didn't even feel weak. Normally it would have been almost completely dead in that time frame. I'm really hoping the problem is fixed now. The car needs to be my DD again soon

    -1994 Lincoln Town Car...KYB Gas-a-Just shocks, tint, 16 inch CVPI steelies, BFG Tires, poly sway bar links...more to come..

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    Beater gonna beat sly's Avatar
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    pop out the relay pack again and feel the relays. If they're not all hot and bothered... you're probably good.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  9. #9
    I'm an air-conditioned gypsy gadget73's Avatar
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    shitty contacts inside the relay or at the socket will also make it hot. Its passing the compressor current through those contacts any time the AC is on. Sometimes the springs get weak inside the relays and it doesn't make solid contact. This one relies entirely on spring pressure to make the connection, it doesn't pull in like the others do.

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    Member ZombieTown94's Avatar
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    Well I haven't noticed the relays hot at all since replacing them. Maybe things are finally going in the right direction. The car has fired right up every time. I guess I need to let it sit for a few days and try again, that would be a true test.. Thanks to everyone that helped out

    -1994 Lincoln Town Car...KYB Gas-a-Just shocks, tint, 16 inch CVPI steelies, BFG Tires, poly sway bar links...more to come..

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