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A/C question

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A/C question

Postby kabeir » Thu May 10, 2018 3:44 am

It was hot today About 90 Degrees Fahrenheit, 32 Degrees Celsius. So, I'm driving down the road with the A/C on, All of a sudden, The Radio, A/C, and my Antenna went down. 5 minutes later they came back on. Could this be a Relay? We checked all the fuses, and they were fine. Anything thing else.
94 XJ6] 96090 miles, 128821 Kilometers
2001 Buick Park Ave. 147000 miles/ 236573 Kilometers
2008 GMC Serria 2500HD SLT. 240000 Miles /386242 Kilometer - Turbo Shot
2010 Ford Fusion 120000 Miles / 193121 Kilometers

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Re: A/C question

Postby naki_k » Thu May 10, 2018 9:32 am

On your 1994 XJ40?
This sounds like cracked soldering in the fusebox.
Standard failure, hence why it’s intermttant.
I would resolder both left and right units to be sure, though the left units are usually worse for some reason.
There’s a number of other threads on there about it, though it can effect any of the electronics.

Whilst you are it it, do the DBC10009 relay too. Same problem. I just did another of mine last week.
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Re: A/C question

Postby M-e-l-l-o-w » Mon May 14, 2018 7:35 pm

Yes I agree, sounds like a classic fuse box dry joint fault.

To add to the above a repair is by far the best option.

Replacement fuse boxes and DBC10009 aux relay boxes will probably have the same or other dry joint faults as the ones you already have!
Even new old stock items can have issues just because they have been sitting on a shelf!!
Removing a working one from another car is not a good idea either as the act of removing it can often make them fail!

In short remove them, take them apart, re-solder all the connections, it will be obvious what joints are bad but do them all, then reassemble them and re-fit them to your car.

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