Help! HVAC system not working at all
Hello. I have a 96 Fleetwood Southwind on an f53 chassis. I recently pulled my unit out of winter storage (had a couple days of -30s and -40s this year) to repair the inevitable burst water lines and now leaky toilet. To my surprise, I had no HVAC on the way home. None of the fan settings worked and even the A/C light wouldn't illuminate when I pushed the button.
I figured it was just a fuse and checked them all, nothing bad. I checked every fuse in the RV fuse box, the under-hood fuse box, and the driver side kick panel.
I pulled the HVAC control panel from the dash and started troubleshooting. I also removed the passenger side false wall and exposed the blower motor. When the MH is keyed to "on" I can hear a relay click when I move the blower selector from "off" to the lowest setting and then another click when I move it to "High." to be sure I pulled the blower relay and checked it anyway, it was fine. I also pulled the blower and wired it to a batter, it runs very strong.
I pulled the resistor pack an can see no obvious damage, however I'm not getting any conclusive resistance readings across any of the pins. Also, I believe that the resistor pack is on the ground end of the circuit. One of the wires going to the resistor pack matches the negative line of the blower motor. So, I shorted that to ground and tried the controls again...nothing.
Here is where things get weird. I pulled the connector from the blower motor and stuck the multi-meter leads into that. "off" reads 0.0 volts, as expected. However, all of the other fan speeds, including "high' read about 12 volts. This reading stays constant until I start manipulating the other HVAC controls. If I change any of the modes the voltage to the motor drops to about 8. when I push the A/C button, it drops to zero.
What is going on? I feel like the resistor pack is probably bad but I should still have high speed. Why am I reading voltage at the plug but when I connect the plug to the motor there is nothing?
Please help!!
I figured it was just a fuse and checked them all, nothing bad. I checked every fuse in the RV fuse box, the under-hood fuse box, and the driver side kick panel.
I pulled the HVAC control panel from the dash and started troubleshooting. I also removed the passenger side false wall and exposed the blower motor. When the MH is keyed to "on" I can hear a relay click when I move the blower selector from "off" to the lowest setting and then another click when I move it to "High." to be sure I pulled the blower relay and checked it anyway, it was fine. I also pulled the blower and wired it to a batter, it runs very strong.
I pulled the resistor pack an can see no obvious damage, however I'm not getting any conclusive resistance readings across any of the pins. Also, I believe that the resistor pack is on the ground end of the circuit. One of the wires going to the resistor pack matches the negative line of the blower motor. So, I shorted that to ground and tried the controls again...nothing.
Here is where things get weird. I pulled the connector from the blower motor and stuck the multi-meter leads into that. "off" reads 0.0 volts, as expected. However, all of the other fan speeds, including "high' read about 12 volts. This reading stays constant until I start manipulating the other HVAC controls. If I change any of the modes the voltage to the motor drops to about 8. when I push the A/C button, it drops to zero.
What is going on? I feel like the resistor pack is probably bad but I should still have high speed. Why am I reading voltage at the plug but when I connect the plug to the motor there is nothing?
Please help!!
