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Old 01-09-2007, 12:27 PM   #1
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Just for general information. All my dash blower speeds quite working while on a trip except for hi speed. The problem was in the resistor pack located under the hood on the passanger side. These resistors are wire wound which drop the voltage for each speed. There is also a diode in the pack which in my case was defective. The resistor pack is made by Ford. Motorcraft part no. FMC4C2Z19A706AA. It can be purched at a Ford dealership (parts dept) My motor home is a 2003 Workhorse Chevorlet V33
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Old 01-09-2007, 12:27 PM   #2
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Just for general information. All my dash blower speeds quite working while on a trip except for hi speed. The problem was in the resistor pack located under the hood on the passanger side. These resistors are wire wound which drop the voltage for each speed. There is also a diode in the pack which in my case was defective. The resistor pack is made by Ford. Motorcraft part no. FMC4C2Z19A706AA. It can be purched at a Ford dealership (parts dept) My motor home is a 2003 Workhorse Chevorlet V33
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Old 01-10-2007, 05:01 AM   #3
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Ken, Thanks for the part number, distributor name, and the location. Good info for my black bag.
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Old 01-10-2007, 08:27 AM   #4
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My problem is just the opposite. Works fine on all speeds but high. Blows the fuse on high.
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Old 01-10-2007, 12:19 PM   #5
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Good chance that your problem is with the relay. The relay should be under $20.00 in a auto parts store.
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Old 01-10-2007, 12:46 PM   #6
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In most cases, the relay is by-passed when the switch is turned to the high speed setting.
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Old 01-13-2007, 01:33 PM   #7
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Ken, just to verify as I had the same problem during recent trip with my Vectra, your chassis is a Chevrolet, but the fan control utlizes a ford resistor pack? Also could you give me a little more information as to where to look.
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Old 01-13-2007, 03:37 PM   #8
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The same thing happened to me. My Workhorse service center fixed the problem eventhough they claimed that it is rightly a Winnebago problem. It was the diode, but I did not know it was a Ford part.
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Old 01-14-2007, 10:39 AM   #9
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Mike, When you are standing in front of your RV with the hood open look for a plug with four wires attached. This will be on the passanger side of RV. The wire colors on my RV is white, orange, green and red. Could be different colors on your RV. Pull the plug from the resistor pack.
Then remove the two screws. One located on each side of the resistor pack and pull the pack straight out. You will see three wire wound resistors (look like small springs. Each one a different size.) Also a small diode. The diode may look ok but be actually bad. Can't tell by looking at it. It can be checked with a continuity tester. To be good you will only get continuity in one direction.
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Old 01-14-2007, 03:37 PM   #10
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Mike Grimes welcome to the forum and the Winnebago forum.
Thanks for joining in enjoy the forums and do post often.
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