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Old 09-15-2014, 09:51 PM   #1
Airstream14's Avatar
Join Date: Jun 2014
Posts: 31
Guages go off when AC gets turned on???

I am working on my 1999 Airstream Cutter with a Cat engine just so you know. I had another thread about gauges don't work and thought I had them fixed.
Ok so my gauges were not working at all so as standard procedure I cleaned all connections to the computer box that run them and they worked After a short celebration and a beer at home with the dog, I proceeded to my next problem. The AC had quit working at the same time the gauges stopped working. I started the unit , gauges worked great turned on the AC and all warning lights came on and gauges quit working:(
I turned the AC off and on again and the gauges started to work then quit.
When I start the engine without the air on the gauges work fine. I can't figure how the gauges are connected to the ac. I guess the computer has taken a dump? The computer was replace 8 months ago. I am thinking about taking it to a dealer but I would bet the dealer would have a lot of time tracking it down also. Second option would be to buy the $350.00 computer again. Third option keep working on it and trouble shoot the AC unit. It has enough gas in it and the pipe runs cold however it always puts out heat. I think the flap door is not opening possibly. I have 20 hours in this problem already and could use any ideas anyone may have. Also my Moral is running low to say the least. This forum is a great help and I thank you for your responses in advance.

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Old 09-15-2014, 10:17 PM   #2
Senior Member
Join Date: Nov 2003
Location: Richmond Hill, GA USA
Posts: 623
Dash AC or Roof AC?

Without knowing the answer to the above question, the symptoms you describe point to an electrical connection that breaks down with additional load placed upon it. It makes this theory more logical if you're talking about the dash AC.

Have you cleaned all battery terminals and examined the cables/connections for broken wires/corrosion?

checked and cleaned all grounds?

Since you've been working on the guages already, I assume you already have the Freightliner SB 54-12 that describes how to troubleshoot the dash instruments (I'm assuming that you have the System III instrument system with the message center).

Please let us know what you find. I have the same system and I'm always interested in learning how problems with it are solved.

Good luck.


Fred & Vicki
Richmond Hill, Ga
2000 H.R.Endeavor/Freightliner/330 Cat
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Old 09-16-2014, 01:31 PM   #3
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Join Date: Jun 2014
Posts: 31

Yes I have cleaned all battery connections and the 2 plugs that controll the gauges. I have the batteries at 100% and I have removed the dash and checked all connections on the gauges. Yes it is the dash air that is causing the problem. I will end up solving this problem I am sure and will post a reply.
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