Author Topic: A/C clutch not working  (Read 402 times)

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TheMadRedneck

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A/C clutch not working
« on: Jul 15, 2019, 07:03:34 AM »
I have an 85 4Runner with factory A/C.  The compressor clutch engages when I jump the wire, but will not come on without it.  Is there a high pressure switch and if not what could be wrong?  Thanks.
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Toybrota

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Re: A/C clutch not working
« Reply #1 on: Jul 15, 2019, 07:51:44 AM »
I have an 85 4Runner with factory A/C.  The compressor clutch engages when I jump the wire, but will not come on without it.  Is there a high pressure switch and if not what could be wrong?  Thanks.
Did you check the associated fuses and wiring? I believe there is a high pressure switch, located with the evaporator? I could be wrong, I don't have AC but I've read up on it because I want it.
There's a sub harness the switch connects too, I'd check there first. Switch could be bad too.

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liveoak

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Re: A/C clutch not working
« Reply #2 on: Jul 15, 2019, 01:45:32 PM »
I know that you have to have a certain amount of refrigerant pressure for the system to engage so it may be low

TheMadRedneck [OP]

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Re: A/C clutch not working
« Reply #3 on: Jul 15, 2019, 04:17:45 PM »
I know that you have to have a certain amount of refrigerant pressure for the system to engage so it may be low

The A/C blows cold when the clutch is engaged.  The pressure is fine.
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liveoak

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Re: A/C clutch not working
« Reply #4 on: Jul 15, 2019, 04:59:06 PM »
ok, I did not know it was blowing cold when jumped. do you have a factory service manual?
I PM'd you
« Last Edit: Jul 15, 2019, 05:12:01 PM by liveoak »

emsvitil

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Re: A/C clutch not working
« Reply #5 on: Jul 15, 2019, 06:19:50 PM »
There's a fuse behind the glove box.
Ed
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TheMadRedneck [OP]

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Re: A/C clutch not working
« Reply #6 on: Jul 17, 2019, 05:41:21 PM »
ok, I did not know it was blowing cold when jumped. do you have a factory service manual?
I PM'd you

Huge thanks!!  Iíve been looking for one.
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TheMadRedneck [OP]

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Re: A/C clutch not working
« Reply #7 on: Jul 24, 2019, 05:38:05 PM »
ok, I did not know it was blowing cold when jumped. do you have a factory service manual?
I PM'd you

I found the A/C circuit in the manual and thought it was probably the low pressure switch since it was also not idling up when the A/C was on.  I jumped the switch and the A/C came on.  Thanks for the help.
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