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Old 06-19-2007, 12:11 PM   #1
tinhutjohn's Avatar
1974 29' Ambassador
London , Ontario
Join Date: Jul 2002
Posts: 76
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Diagnosing AC

The last time we used the trailer,a 74 International, the original AC would not cut in, although the fan would run. Any "list" of things to try to diagnose what's happening?
Thanks for all your help

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Old 06-20-2007, 12:04 PM   #2
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1971 27' Overlander
Central , Ohio
Join Date: Jun 2006
Posts: 2,365
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We are having problems with our a/c as well. Found an old guy who's done a/c repair for years. Nice of him - advised before we spend anything on repairs - clean the unit. The inside areas and the filter. Up top take the cover off and make sure there are no nests/webs/leaves - spray it down and scrub it well - try it again.

Maybe worth sharing with you....good luck....

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Old 06-20-2007, 12:15 PM   #3
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Sarge, as the fan runs, but the compressor does not, the thermostat may be defective. I fixed this by consulting the maker's website for a wiring diagram, cutting the wires to the internal thermostat, and installing a wall-mounted digital thermostat, which, in any case, is a great improvement. To avoid the possible waste of buying a thermostat, only to find there is another fault, just shorting out the two wires to the internal thermostat would test the idea. Details of fitting the external thermostat are here:
I'm assuming you have an internal thermostat. If you already have an external thermostat, then you can just short across the wires leading to it. The usual safety caveats apply.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
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