flatmotor Posted August 25, 2023 Share Posted August 25, 2023 On my A/C switch behind radio the power wire and some of the fan switch are getting hot to touch.Already had a small fire there a year or so.Have changed blower motor and switch.And it still get hot so can;\'t run a/c.Haven't been able to work on it because of moving in the last year.But are getting back at it.Any sugesstion on what to do,Thanks. Quote Link to comment Share on other sites More sharing options...
71SSclone Posted August 26, 2023 Share Posted August 26, 2023 I would start at the blower motor resistor, make sure the plug and resistors are not melted. John Quote Link to comment Share on other sites More sharing options...
flatmotor Posted August 28, 2023 Author Share Posted August 28, 2023 I have replaced both resistors.The brown wire is the one getting warm and one of the switch wires is also,Thanks Quote Link to comment Share on other sites More sharing options...
71SSclone Posted August 28, 2023 Share Posted August 28, 2023 This might help. Edit- No. this will not help. Its for a full size Chevy. The correct one is below Quote Link to comment Share on other sites More sharing options...
Scott S. Posted August 28, 2023 Share Posted August 28, 2023 Don, Is the wiring original ? It could be that the wire itself has deteriorated and can no longer carry the current. Might want to think about replacing/upgrading the wiring...... Just a thought. Scott. Quote Link to comment Share on other sites More sharing options...
jft69z Posted August 28, 2023 Share Posted August 28, 2023 18 minutes ago, 71SSclone said: This might help. That's not for a Monte though. Quote Link to comment Share on other sites More sharing options...
71SSclone Posted August 28, 2023 Share Posted August 28, 2023 Whoops, took a picture of the wrong page. Thanks for pointing that out 2 minutes ago, jft69z said: That's not for a Monte though. 1 Quote Link to comment Share on other sites More sharing options...
71SSclone Posted August 28, 2023 Share Posted August 28, 2023 Here is the correct diagram 3 Quote Link to comment Share on other sites More sharing options...
jft69z Posted August 28, 2023 Share Posted August 28, 2023 This may help ID the dash parts. 2 Quote Link to comment Share on other sites More sharing options...
flatmotor Posted August 29, 2023 Author Share Posted August 29, 2023 It is the master switch that get not real hot but you can feel it.It is the one that caught fire and the fan switch also ,Had to pour water on it to get fire out.Melted the upper a/c vent.The original wiring harness.I pulled it out when I did the frame off and rewrapped it but I guess it could ne too old like me.Almost to the point to change to a Vintage Air unit.Thanks for comments Quote Link to comment Share on other sites More sharing options...
cbolt Posted August 30, 2023 Share Posted August 30, 2023 Its a short somewhere. I would start by carefully inspecting the wires for evidence of a bare wire touching either a metal area or another wire. It could also be a faulty switch. Chasing electrical issues is never fun but on old cars its usually necessary. Good luck! Quote Link to comment Share on other sites More sharing options...
flatmotor Posted August 30, 2023 Author Share Posted August 30, 2023 I have replaced the fan switch because it melted when it caught fire.Will go through it again.Will drive with no a/c till I fix it.Thanks Quote Link to comment Share on other sites More sharing options...
1970mcss Posted August 30, 2023 Share Posted August 30, 2023 Did you replace the high blower relay? Mine was bad and it shorted out the master blower switch. I replaced them both and everything is working as it should. 1 Quote Link to comment Share on other sites More sharing options...
flatmotor Posted August 31, 2023 Author Share Posted August 31, 2023 yes I replaced both relay and resistor and fan switch along with the blower motor.I will keep checking Thanks Quote Link to comment Share on other sites More sharing options...
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