Weird air cond issue in my 69 GT500 (Automatic) I'm driving around, air cond blasting (All major air cond components are brand new) then randomly the air just shuts off. Fan stops, dead, no noise or warning. I shut the fan off, drive a few minutes, and turn it back on and it works. Drive for a while and it quits, shut it off for a few and it works again.
Any ideas?
BTW, I love posting this stuff here, I've learned a lot from all of you who respond!
Kinda sounds like a relay is getting hot, and cuts the power. Some sort of an electrical issue. I'd check the switch with a voltage tester.
Quote from: crossboss on August 26, 2026, 02:41:59 PMKinda sounds like a relay is getting hot, and cuts the power. Some sort of an electrical issue. I'd check the switch with a voltage tester.
Hey Vegas! Have I seen you around town at car events?
I'm a bit dense on this stuff, What switch should I test?
Quote from: Brian350 on August 27, 2026, 02:52:22 PMQuote from: crossboss on August 26, 2026, 02:41:59 PMKinda sounds like a relay is getting hot, and cuts the power. Some sort of an electrical issue. I'd check the switch with a voltage tester.
Hey Vegas! Have I seen you around town at car events?
I'm a bit dense on this stuff, What switch should I test?
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Sometimes I go to the Cars n Coffee in Henderson off the 215. I would check all the switches/connections. Possibly a short/relay getting hot. Start with the basics. Also Google air conditioning cutting out...
if its the fan that stops blowing. you need a new switch. the relay is part of the switch. if the air cond is not operating, the electric clutch on air compressor is faulty. my guess, try the switch first.
Quote from: highland green on September 01, 2026, 10:20:14 AMif its the fan that stops blowing. you need a new switch. the relay is part of the switch. if the air cond is not operating, the electric clutch on air compressor is faulty. my guess, try the switch first.
Yeah, the AC blows nice and cold for a while then the fan shuts off, then a few minutes later I can turn it back on again. Compressor is new.
I have never had a 69/70 with a/c, so these are general guesses.
It could be as simple as crap in the cowl restricting air flow causing the fan to work harder. Could also be lack of lube on the blower motor bearings (bushings). After it cuts out, feel the blower motor to see how hot it is.
Quote from: KR Convertible on September 03, 2026, 02:55:10 PMI have never had a 69/70 with a/c, so these are general guesses.
It could be as simple as crap in the cowl restricting air flow causing the fan to work harder. Could also be lack of lube on the blower motor bearings (bushings). After it cuts out, feel the blower motor to see how hot it is.
Thanks, I'll add this to my check list...
The first thing I would do is while the fan is inop check ground and power at the fan , that can be done with a basic self powered test light. Just don't touch anything . If you get both and the fan doesn't work its the fan itself.
Quote from: Lincoln tech on September 03, 2026, 05:58:40 PMThe first thing I would do is while the fan is inop check ground and power at the fan , that can be done with a basic self powered test light. Just don't touch anything . If you get both and the fan doesn't work its the fan itself.
Added to check list...thanks...
Just curious, did you resolve the A/C issue?
Thanks for asking Cross, not yet, got derailed by radiator and power steering issues, both of which are being solved today. Then I can focus on the AC, just as the weather here cools off!
Check the circuit breaker mounted just above the fuse box. Pretty sure the A/C runs through one of them. When it trips, it resets itself. They will sometimes get weak with age. Or something is pulling too many amps and tripping it. Mike
Quote from: mr68shelby on September 28, 2026, 12:52:06 AMCheck the circuit breaker mounted just above the fuse box. Pretty sure the A/C runs through one of them. When it trips, it resets itself. They will sometimes get weak with age. Or something is pulling too many amps and tripping it. Mike
Interesting. I'll take a look. Is that breaker easy to replace?
Sorry for the delay in replying. I've been out of town. It is not real hard to replace if you can get your arms and hands under the dash! Mike
No prob Mike, thanks for the reply. My current struggle is that I can barely get under the dash (69 years 0ld ;D ) and I can't really see anything (From my limited vantage point) that looks like a circuit breaker. I'm still going to pursue this idea, but I'll need some help...
Quote from: Brian350 on October 07, 2026, 07:35:44 PMNo prob Mike, thanks for the reply. My current struggle is that I can barely get under the dash (69 years 0ld ;D ) and I can't really see anything (From my limited vantage point) that looks like a circuit breaker. I'm still going to pursue this idea, but I'll need some help...
Taking out the driver seat will help a lot with access. Some of us can still manage without doing that but 4 nuts underneath and the driver seat is free to take out.
Quote from: Bob Gaines on October 07, 2026, 09:36:25 PMQuote from: Brian350 on October 07, 2026, 07:35:44 PMNo prob Mike, thanks for the reply. My current struggle is that I can barely get under the dash (69 years 0ld ;D ) and I can't really see anything (From my limited vantage point) that looks like a circuit breaker. I'm still going to pursue this idea, but I'll need some help...
Taking out the driver seat will help a lot with access. Some of us can still manage without doing that but 4 nuts underneath and the driver seat is free to take out.
Good point. Or I can hire someone else to climb under there...