I just purchased a pretty nice, older ford E-350 superduty van. It has rear AC/Heater. The front heater works great, but the rear heater does not blow hot air, just cold. There's no place to adjust the temperature on the rear heater (it runs off the front controls).
The Haynes manual doesn't go into the rear heater too much, so I was looking for some direction. Does anyone have any suggestions on where to start my diagnosis?
I did some snooping around in the rear heater... The condenser in the back is getting hot, but there's no air going through the intake to pass through the condenser. I'm not sure how to get in the compartment to check things out though.
Well... I guess I asked for a place to start didn't I? Thanks gearloose1. At least you didn't tell me to open the door, insert key into the ignition and start the engine.
I've gotten to the blower motor in the back. It seems that when I turn it from cold to hot on the thermostat, the door inside the blower assembly doesn't switch from A/C to Heater. The vacuum line looks like its in good shape, but makes no sound when turned from cold to hot. Has anyone run into a problem like this?
More troubleshooting resulted in getting the heater to work by disconnecting the vacuum line that goes to the blend door actuator. When I disconnected it, the door opened right up and switched from AC to Heat. So no matter where I the thermostat is on the panel, the vacuum line is keeping the heater door closed. Sounds like an instrument panel issue. Any help from here?
Did you end up figuring out what was wrong? I've got the same problem in a van I just bought. Haven't gotten into it yet but now that I've got a place to start I might get it pulled apart over the weekend.
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