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dave1518 · 08-27-2012, 11:04 AM

I have a 88 Winnebago Chief on a Chevrolet chassis.
The 25 amp fuse for which is labeled HEATER has started to blow.
I can replace it and it the fun will run for a period of time, and then it will blow again. My assumption was that the blower motor in the squirrel cage was simply heating up and needs to be replaced.

Dismantled what seems like the entire RV to get to where the heater motor is located. Too the assemly out ...tt has a single wire connection, and the ground was rusty so cleaned it up.. Plugged the motor back in and then turned on the Ignition to Acc and ran the motor on VENT... It ran for over hour with no problems at med-high speed...

I did notice that there seems to be a "TUBE" from the output that looks goes up to a hose that is not connected...This hose looks like it should connect to a hole on the motor so that air would blow into the motor housing but the motor is 180 from that spot. I have not checked to see if I could rotate the motor so that the tube can connect...

I want to assume that this testing proved the blower motor to be good and that I might need to look at some other component for the problem..somewhere I get a thought that there could be a problem with the AC clutch on the engine but not sure where that idea comes from.

Any suggestions would be welcome.

What else should I test? Does the Chassis AC clutch run through this same fuse?

deandec · 08-28-2012, 12:03 PM

I cannot answer your chassis specific question.

On my rig, the dash AC is wired to the chassis battery and hence so is the fuse.

The furnace is wired to the house battery and hence so is the fuse.

dave1518 · 08-30-2012, 11:32 AM

Traced out more of the wiring and talked with Winnebago Service... The only thing on the blower motor circuit is in fact the the resistor, relay and the motor. The consensus is the motor is heating up and increasing current draw

calhyatt · 08-30-2012, 03:48 PM

Quote:

Originally Posted by dave1518

I have a 88 Winnebago Chief on a Chevrolet chassis.
The 25 amp fuse for which is labeled HEATER has started to blow.
I can replace it and it the fun will run for a period of time, and then it will blow again. My assumption was that the blower motor in the squirrel cage was simply heating up and needs to be replaced.

Dismantled what seems like the entire RV to get to where the heater motor is located. Too the assemly out ...tt has a single wire connection, and the ground was rusty so cleaned it up.. Plugged the motor back in and then turned on the Ignition to Acc and ran the motor on VENT... It ran for over hour with no problems at med-high speed...

I did notice that there seems to be a "TUBE" from the output that looks goes up to a hose that is not connected...This hose looks like it should connect to a hole on the motor so that air would blow into the motor housing but the motor is 180 from that spot. I have not checked to see if I could rotate the motor so that the tube can connect...

I want to assume that this testing proved the blower motor to be good and that I might need to look at some other component for the problem..somewhere I get a thought that there could be a problem with the AC clutch on the engine but not sure where that idea comes from.

Any suggestions would be welcome.

What else should I test? Does the Chassis AC clutch run through this same fuse?

Blower motor is shot and should be replaced. Old motors with bronze sleeve sealed bearings wear out and draw too many amps. Change out the motor and that should cure your problem. Blowing a 25 amp fuse is no joke. Luckily the circuit is fused. Take care and Seeya on the road.