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Old 06-07-2014, 08:30 PM   #1
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Join Date: Oct 2011
Location: Martinsville, IN
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Dash Blower Motor Question

Ok...so question number 3 for today.

last year the blower fan went out on the dash aircon. apparently it is a gm part so the repair place ordered a new one and installed it.

when I picked the coach up they said I noticed it blows at about half the speed it did before...maybe less. I can get it blow a little faster if I switch the passenger side up....did the rv shop screw it up...or is it something else

I am going to call them to see if they can fix, but that was last year. they had the coach for 3 months fixing various things and I needed back...hind sight 20/20 should have made them fix it right.

anyone out there replaced the dash fan with something and have it work correctly?

Aaron Johnson
2002 Alpine Coach 74553
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Old 06-07-2014, 09:17 PM   #2
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Gulf Streamers Club
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Location: Cincinnati
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Not sure what you mean by, "switch the passenger side up?" You should contact the shop and make sure they installed the correct fan motor. The fan is controlled by a 'resistor pack' that has large resistors that absorb some of the power to reduce speed. Make sure you have the 3 or 4 distinct different speeds you should. If the speeds not all present, perhaps they connected wires incorrectly. If you find the resistor pack, which is usually mounted on the air box so the resistors are in the fan's air flow, you could check the wire connections and even jumper around it to see if fan speed increases directly wired.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 06-08-2014, 04:36 AM   #3
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Damon Owners Club
Workhorse Chassis Owner
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Posts: 21,174
By switch the passenger side up he means close the vents so it's all concentrated on the driver's side.. At leat that's my guess.

The HEVAC blower on the Workhorse with Evans HEVAC does indeed use a standard Chevy blower.. I have two of them, one is salvage from a pick up truck.

The system kind of works like this

You have a switch that sends power to one of two leads on a resistor, the resistor is in "Front" (under the hood) in front of the passenger seat in teh air plenum. This feeds the motor

FOR low and medium speeds the switch also feeds a "low speed relay" which actually passes the power to the resistor.

For HIGH it feeds the HIGH SPEED RELAY which feeds, I believe, the top terminal on the resistor (Which is also the one the blower connects to)

If you are not getting high speed there are three possible situtations.

1: High speed relay failed so you only get low speed.
2: Wrong blower, not the motor, but the blower.
3: Bad connection somewhere along the way.. Blower motor ground is suspect number one

TO TEST blower motor ground

Run blower 5 minutes and using a dampened finger feel the screw. if it's hot (tap it may be very hot and if you tap with a dampened finger you do not get burned, think frying pan hot or steam iron hot) then remove screw, clean paint off with Wire Brush on Dremel and replace screw and lug.
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Old 06-08-2014, 08:35 AM   #4
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Location: Martinsville, IN
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the switch in front of the passenger seat turns the passanger side controls on and off. I'm pulling the wiring diagram out today to see what they messed up.

Aaron Johnson
2002 Alpine Coach 74553
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