StoogeMoe

I was wondering if anybody has a HVAC control unit to sell, either from a parts car or from a car that was converted to a race car.

The symptom is no heat. I looked at the heater control valve and it was being pulled shut. So I disconnected the vacuum line, and still got no heat. I found that the temperature mixing flap was closed, so I removed the linkage to open it. Now I get heat.

So the next thing I did was pull out the HVAC control unit and unplug the two connectors. I measured the exterior, interior, and mixing chamber sensors. They are all within spec. I then cleaned the pins and reconnected it hoping for the best. It didn't change anything.

I then pulled the connector for the motor at the mixing flap and applied 12v to pin 4 and 5. I was able to make the motor move each way by reversing the polarity. I also tested the voltages at the connector and they don't match what the FSM says they should be when I turn the temperature **** to full heat.

So the only conclusion I can make is that the control unit is bad. All the other flaps work fine. Just the mixing flap is dead.

I need this thing: Thanks!

J1720

PM

StoogeMoe

PM responded to...

tod84944

Let me know if you can't work something out with the person who responded first. I have a good unit.