I have recalibrated my blend doors no lights flashed my thermastat has been replaced twice my coolant is full what else could it be maybe my recirculating door? or jumped off the track if so how can i fix this myself? 1999 grand caravan 3.3 engine automatic

 

What is the issue? No heat? Both of the heater hoses very hot?

 

Both of the heater hoses get hot the same temperature when i recalibrate their is heat from one of the doors but then it leaves when the recalibration is done we are having the computer for the heat control head read today

 

The temp sliders for the temp go bad. Probably need a new control head.

 

"The temp sliders for the temp go bad. Probably need a new control head."

Just curious Tizzy. This is apples and oranges but I had a Camry a few years back that the temperature slider switch went flackey on. Select the amount of heat you want and it may or may not stay warm. Push up or down on the switch and the heat would return.

I took the head out and disassembled it (great fun). I found the soldered contacts securing the switch to the circuit board were cracked (sound familiar - 3rd gen clusters). Re-flowed the solder, reassembled and all was well. Just wonder if you or anyone you know of has attempted similar on a head for a Caravan or if it's even possible. Is it an option for kittykat if it is indeed a bad slider switch?

 

It's a rheostat that goes bad. When you move the slider, the reading will only change a minimal amount, usually stuck on the cold setting. But it doesn't open circuit or go intermittent, when they go, they go.

 

Then for the adventurous they could desolder the rheostat and solder a new one in as long as you don't have to destroy the head to get at it and you can get the correct replacement rheostat from an electronics source.