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Old 06-27-2012, 09:27 PM   #1
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FTL Chassis Air Condensor Fan

On my 2001 Cruisemaster with FTL Chassis the dash air does not blow cold air. I've added 3-1/2 cans of R134a using a hose with a low pressure gauge only. The system will go low (20 - 30 psi) and take some freon then go high up to 70 or 80 PSI and stop taking freon and then go low and take more freon. It does this over and over but finally takes the freon. I noticed that the condensor fan is not coming on. The condensor is located under the chassis in front of the front axle. I'm pretty sure it needs the fan to run to cool the condensor. I've checked the fuse to the fan and it is good. I guess my next step will be to track down the relay. Does anyone know where it may be located? Also, am I on the right track here?
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Old 06-27-2012, 09:39 PM   #2
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If the A/C compressor clutch is cycling and the fan is not your on the right track, test the fan by feeding it power direct from the battery. If the fan works try back tracking the wiring to find a relay. If there isn't a relay in the F/L relay in the under hood power centers then the A/C was added by the coach maker and you'll just have to track it down.
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Old 06-27-2012, 09:44 PM   #3
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Take a look at this website,Yes the condensor fan should run with AC On.
Evans Tempcon, Inc
Click on the Electrical Schematics and read up.
My 40' MH has a total of 3lbs. of 134a freon in the system,per installer label.
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Old 06-28-2012, 06:17 AM   #4
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If you have added 3.5 cans of freon, you need to repair the leak. That means it was near empty and possibly air got in the system and it needed to be evacuated.

AC systems do not use up freon. I would suggest a refrigeration tech look at it and check hi and low pressure and test the freon for moisture and oil content, if that much freon leaked out the some oil leaked out with it and needs to be replaced.
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Old 07-01-2012, 08:01 AM   #5
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Success! Well almost. Thanks to Skip426 and Siggyd I got the schematic off the Evans Tempcon website, applied 12V directly to the fan (it worked) and traced the wiring from the fan up through the chassis to find the relay. I lucked out in that the wires went directly to the front of the firewall below the expansion valve. The relay was actually down at the frame but was not secured with any screws. I got a new relay at the local auto parts store, plugged it in, fired up the cat and turned the AC on max. The AC was blowing cold air in less than one minute! Only thing is the condensor fan makes a high pitch whine. Anyone know if this is normal? There is a backing plate on the back of the fan. I thought I might try removing it and lubricating the bearing. If I do, however, will springs, magnets and such fly out 100 different directions. Anybody out there tried lubricating the condensor fan? It's an Evaans Tempcon although they probably are not the OEM.
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Old 07-01-2012, 08:20 AM   #6
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Lubing the fan in theory sounds good and may even work temporarily (if you can even do it) but the fan is bad, you'll have to change it.
The plate can be removed and there may be a washer or 2 that sits on the shaft but the bearing is probably a sealed type and not repairable.
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