A/C switch the engine is not rising the RPM?

Tiny
DAMOY
  • MEMBER
  • 1997 TOYOTA COROLLA
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 284,655 MILES
So I notice whenever I turn on the A/C fan it's not just the fan alone turn on the A/C compressor turn on as well and the A/C button seems to have no use. Also, the engine is stalling because the A/C compressor is taking all power because the engine is not rising the RPM to run it.
Wednesday, November 20th, 2024 AT 8:53 AM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,148 POSTS
Yep, these cars had a problem with the AC amplifier which runs the system, here is the location so you can change it out which should fix the problem. I would get a used one by searching eBay, check out the images (below). Please let us know what happens.
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Thursday, November 21st, 2024 AT 11:20 AM
Tiny
DAMOY
  • MEMBER
  • 6 POSTS
Thanks for you respond and I'll do as you say and get back to you.
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Thursday, November 21st, 2024 AT 1:02 PM
Tiny
DAMOY
  • MEMBER
  • 6 POSTS
I've just went to try back the car AC and I disconnect the AC amplifier plug and the AC compressor is still working blowing cold air, only the light that should be in the AC button gone when I disconnect the Amplifier. So basically the fan switch turn on the compressor which I want to stop and work properly. Also once in a while the AC amplifier works
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Thursday, November 21st, 2024 AT 1:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,148 POSTS
So you say the compressor works with the AC amplifier unplugged? Because the amplifier controls the compressor relay. I am wondering if someone has rewired the car? Please look at the AC system wiring diagrams below to see what I am talking about. Check out the images (below). Let us know what you find.
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Friday, November 22nd, 2024 AT 11:50 AM
Tiny
DAMOY
  • MEMBER
  • 6 POSTS
Yes that is what I'm saying. To my understanding someone who had the car before must have had it rewired so when the fan switch turns on the whole system compressor turns on and there goes the engine stall. I have to get a universal step-up valve to used. Also, the idle control valve is malfunctioning, or it could be wiring problem because when I unplugged it sometime the idle get high and low it's not stable.
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Friday, November 22nd, 2024 AT 12:19 PM
Tiny
DAMOY
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  • 6 POSTS
I'm guessing the connection run from the fan switch to the relay, once the relay removed no power is there and the AC amplifier disable to control the compressor that's what I think.
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Friday, November 22nd, 2024 AT 12:22 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,148 POSTS
Yep, it sounds like the wiring got messed with, probably because of the bad amplifier so they tried to bypass it. I would try to put the wiring back to stock using the wiring diagrams above.
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Saturday, November 23rd, 2024 AT 9:09 AM
Tiny
DAMOY
  • MEMBER
  • 6 POSTS
I'm definitely going to do that and thanks for your help I really appreciate it.
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Saturday, November 23rd, 2024 AT 3:13 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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You are welcome, let us know how it goes.
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Sunday, November 24th, 2024 AT 11:06 AM

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