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Topic: Dash AC (Read 473 times) previous topic - next topic

Dash AC

During a trip this last week, while driving my dash AC would go off suddenly for about 2 minutes then suddenly come on again.  This happened about 5 times and appeared to be random.  I didn't do anything after it went off to make it come back on.  Any ideas why this would happen?
Kearn
Kearn
'92 U300 40 ft.  WTBI  6V-92  #4130
GMC Yukon toad
'08 Casita Spirit Deluxe 17ft

Re: Dash AC

Reply #1 –
Sounds very familiar.  The problem I had was the fan would shut off intermittently when but only when on "high" speed.  I don't know if this is the same problem as yours. 

I discovered when the fan is on "high" the power is supplied by an auto relay which is off on all other speeds.  Replaced the relay and haven't had the problem since.  IIRC, the old relay would get warm (or even hot) which helped me find it.  The relay is an "auto" style (typically Bosch brand), many are used under the dash.  They have a blade style single connector for the 4 to 5 wires that connected to it - easy to swap once you figure out which one it is.
John Fitzgerald
1991 U300 (SAI) Side Aisle Island Bed 40'
Detroit 6V92 with Allison Retarder
Meridian (Boise), Idaho

Re: Dash AC

Reply #2 –
Hi John
Is that relay available at NAPA or FT?
What side of the engine should I be looking?
Thank you
John
1998 U270 34'

Re: Dash AC

Reply #3 –
Thanks John.
It was very hot so it was on high all the time.  Sounds like the same problem.
Kearn
Kearn
'92 U300 40 ft.  WTBI  6V-92  #4130
GMC Yukon toad
'08 Casita Spirit Deluxe 17ft
 

Re: Dash AC

Reply #4 –
Quote from: John/Pat –
Is that relay available at NAPA or FT?
Any auto parts store should have them.  They seem to be universal with numerous companies making them and to the best of my knowledge all interchangeable with each other and even have the same terminal numbers on them.  I'm sure you'll recognize them: Amazon.com : Car Auto Truck Relay & Socket SPDT 12V 12 Volt DC 40A AMP 5Pin :
Quote from: John/Pat –
What side of the engine should I be looking?
It's not near the engine, it's under the dash.  For your U270, I'm not even sure it uses one of these for that function.  I would think your schematics might help you find it if it does.  FWIW, on my coach the relay is to the right of the steering column almost directly behind the ventilation controls.
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John Fitzgerald
1991 U300 (SAI) Side Aisle Island Bed 40'
Detroit 6V92 with Allison Retarder
Meridian (Boise), Idaho