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Old 05-15-2012, 06:54 PM   #1
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cab air conditioner

When we have the air on while traveling, the fan blowing motor keeps going on and off. Has anyone else had this problem.
The air is cold, but it will blow air then stop then blow air then stop. It doesn't stay off very long at all.
It is a freightliner chassis........ Damon Ultrasport
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Old 05-15-2012, 08:19 PM   #2
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Are you talking about our dash air?

If so, I have been working through the same problem.

I have replaced everything except for the themostat. I believe that is the problem.

Do you have a Evans Tempcon unit?
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Old 05-15-2012, 09:06 PM   #3
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Not sure what i have. Yes i am asking about the dash air. It is a cummings diesel. Would the thermostat affect the motor on the fan blower?
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Old 05-15-2012, 09:09 PM   #4
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Is the dash air fan motor turning off and on, or is the internal damper diverting the air flow to the defrost vents?
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Old 05-15-2012, 09:33 PM   #5
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It will blow air then completly stop then start again a few seconds later.
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Old 05-15-2012, 09:42 PM   #6
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It will blow air then completly stop then start again a few seconds later.
The next time it happens, feel at the defroster outlet and see if it has changed to defrost. It is quieter at the def. and you will think it is off when it is coming out there. The outlets default to defroster. If you have a slow vacuum leak, it can do this.
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Old 05-15-2012, 10:31 PM   #7
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I will check that out, thanks everyone for all your help.
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Old 05-16-2012, 09:27 AM   #8
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I will check that out, thanks everyone for all your help.
Please let us know what you find out.
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Old 05-16-2012, 11:15 AM   #9
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We checked it today it is still stopping and starting, but there is nothing coming out of the defrosters.
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Old 05-17-2012, 06:51 AM   #10
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We checked it today it is still stopping and starting, but there is nothing coming out of the defrosters.
Next time it stops, go out front and look and listen in the front access door. When the fan comes back on you should here a click. That will. E the resettable fuse or relay. They may be the problem. If you find them- replace them and see if that fixes the problem.
Do you hear any squeaking noises coming from the dash fan motor?
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Old 05-17-2012, 03:26 PM   #11
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Sure sounds like a relay on the fan motor circuit to me. As you know, relays are simply an electrical switch within a given circuit. When they overheat, they are designed to switch off until they cool down in order to protect the system. Simple to test....find it and use your test light to see if the test light goes out on the outlet side of the relay when the fan shuts off. If it does, but power is still going into the relay, you have likely found the problem. If the fan goes off but your light stays lit on the relay outlet side, then they relay is not the problem. I would then do the same type of test on the fan motor switch. Some switches have a similiar protection device that can fail.

Please let us know you make out....thanks!
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Old 05-30-2012, 12:28 AM   #12
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Might simply be a little corrosion on one of the connectors, try spraying all with WD40, inside and outside, disconnect the ones that are easy and reconnect.

Look for any ground wires and tight them up if possible.

Check for wire nuts, some installers use them to save time. Big No No in vibration prone areas unless sealed with silicone. Replace with solder or crimp splice.

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Old 05-31-2012, 10:34 AM   #13
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I have a 2005 Workhorse chassis Damon Intruder.. In my case the blower will run for a while then nothing.. It does not (usually) come back on by itself.

Shutting off and coming back on sounds to me like a thermal circuit breaker (Self resetting type)

I am thinking in my case bad relay, am searching for the relay.. For the moment however I have bypassed all heater controls and "Hard wired" the speed I desire via an aux switch... Alas, I do not like this solution, but It will "narrow the suspect list" for me come Sunday. (when next I drive)

If anyone knows where the relays are..... I found what may be ONE relay but there should be 2 of them.
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