Question1997 chrysler concorde v6 heater blower runs on high,all heating and a/c controls will not work. The off control will not work. The only way to stop the blower is to pull the blower fuse.
AnswerHi R. Davis,
There are probably two things that are at fault, which need to be checked. I assume that you have the normal climate controls, not the automatic one with the digital readout of temperature. If that is not the case, then write back and tell me.
The Climate control unit (also called the control head) is powered by a 10A fuse in position #6 of the junction box under the dash. It also powers the back-up lamps (and also the anti-lock brake controller if you have that feature) so if those aren't working then that fuse is blown. If you find it to be blown then it would be useful to check which of those two or three units may have caused the fuse to blow, or it may just be a fuse whose center wire has fatigued and has a crack in it. You can either replace the fuse and see if it blows again when you try the control head or the back up lights of start the engine and try the ABS and which ever blows the fuse again is at fault. Or if you have a digital volt-ohm meter you can measure the resistance from the cold side of the fuse socket (the one that doesn't have 12V on it when you have the ignition switch in the "run" position) to ground (any shiny body metal surface nearby to the fuse socket). The fuse should not blow if you find that the resistance is not less than 2 ohms when you try each of the three modules that it powers, so then you could put the fuse in without fear of just blowing it again.
Once you have power restored to the head unit, then the other controls will work. If the blower only operates on high nonetheless, then the problem is that the blower motor resistor block has blown out its resistors and needs to be replaced. That is a common item that needs replacement. It is located under the dash (remove the right lower edge of the instrument panel to get visual and manual access to it).
Once you find the blower motor housing on the underside at the right hand end of the HVAC air system unit, notice a couple of wires from the blower motor go to a multi-wire plug nearby on the air duct adjacent to the blower. If you remove that plug you will see that it is part of a rectangular element that is held in the duct by 2 screws. Remove those screws and pull out the element which a the resistor block in question. If you examine it you should notice some of the wires associated with the resistors are burned through. In any case, go to a dealer or maybe a well stocked parts store and buy a new resistor block and put it back in the duct. Check that the resistors are not touching one another, and gently separate them if they are with the tip of a pencil, before inserting it in the duct.
That should restore the multi-speed function of the blower.
Let me know if this approach doesn't fix the problem. If you get the control unit to function but other aspects are still not working there is a self-diagnostic test that you can run using the buttons on the control head, but it is too lengthy to type in to this message. I can either xerox and postal mail it to you, or as time permits I can enter it into an answer by hand.
Good luck on fixing this.
Roland
