What is that infernal clicking? - Defender Source
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Old February 15th, 2013, 07:54 PM
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What is that infernal clicking?

So my beloved '97 NAS D90 SW has developed an interesting tic. Or, that is to say... click.

It's a relay switch. Of that, I'm sure. It togges on and off. Then on. Then off. Usually a second or two between clicks. Then stops for a minute or two. Then does it some more.

Odd.

The sound is coming from the passenger footwell (from under the A/C unit, I think) and it's notable louder than blinkers relay.

Any guesses? Seems to happen when the truck warms up, on the highway, when I can't get to it to figure out where it's coming from.
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  #2  
Old February 15th, 2013, 09:31 PM
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Amazing, Josh's started doing the same thing, we were just talking about it.
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Old February 16th, 2013, 11:12 AM
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I had the same thing. Mine sounded like it was coming from the a/c in the passenger footwell.
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Old February 16th, 2013, 12:01 PM
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If it's like Josh's, it is clearly electrical in nature, as soon as you turn on the ignition it starts, and it sounds like a relay. Very regular timing, it wasn't erratic at all.

It's not a rattle or squeak kind of thing.
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Old February 16th, 2013, 12:50 PM
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it could be the a/c cycling on and off during use of the hevac in order to dry the cabin air...
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Old February 17th, 2013, 01:55 AM
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Quote:
Originally Posted by JSBriggs View Post
Have you tried to pull the AC fuse to see if it stops?
Negative. I have no idea where to begin so this is just as good a place as any.
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Old February 18th, 2013, 06:59 PM
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New info. When it's clicking it has zero impact on AC function.

Also... whatever that relay switch might be, it always clicks on when I turn the key in the ignition. Not when I engage the starter, when I turn the key from off to the half-way position when all the dash lights power up.
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Old February 19th, 2013, 12:27 AM
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You need to start pulling fuses and note when it stops. Then we can trace the wiring diagram to the offending part.
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Old February 19th, 2013, 05:29 AM
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How about pulling the relays one by one?
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Old March 15th, 2013, 05:47 PM
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Resolution:

It was the relay closest to the firewall on the outside edge of the A/C unit (Passenger side). Turns out the cooling fan (Part # STC3969G) controlled by that relay had seized up.
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