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Heater Problem -------------------------------------------------------------------------------- It was the connection between the motor and the blend door. I took the whole dash out to see the problem. I bought a new motor and tried it and the old one by hooking the batery back up and...

btexpress - thanks for the information!

97 Heater Problem - blend door actuator - temperature door jtsmith - thanks for all the good information! The valve I used a wire to partially close is the coolant bypass valve. I thought this controlled the coolant flow to the heater's exchanger and I see now that is just shuts when the AC is...

I used a wire to pull the valve in the collant line partially closed manually, I did not jumper anything. THis has one large wire or tube goping to it so I thinmk it is controlled by vacuum, there is no ground wire.

My heater is either on full or off. The controlswitch does not adjust the valve. I've found the valve and used a wire to make adjust it. Is this valve vacuum controlled? How do I tell if it is the control switch inside on dash or this vlave?