1992 Toyota Pickup AC Fuse Blows

1992 TOYOTA PICKUP
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AEDWAR1
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  • 6 POSTS
i was driving down the road & my ac went out. i don't have a broken belt, or blown fuse. coolant pressure is good. but when you push the ac button it will not light up, nor will the compressor come on.
Apr 17, 2006 at 1:15 PM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
There are several ways to verify the compressor is good. One is to activated with 12V and the other is to take coill resistance which should be about 3-5 ohms. If you activare the compressor verify that the pressures should read about 35 low and 150 high + or -

That Toyota also has an A/C amplifier controller which have been known to go bad. It is a black box about the size of a big cigarette pack and is located in a slot in the evaporator housing behind the glove compartment.

The A/C circuit for you truck is a bit complicated. I will be glad to send a schematic if you want.

All A/C relays and fuses are located behind the glove compartment. There is a 10A A/C fuse in that fuse block #3 that you might have missed. Good luck and let me know.
Apr 18, 2006 at 10:43 AM
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AEDWAR1
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what does the a/c amplifier controller do? i found the fuses, and as soon as i engage the a/c it blows. i would appreciate a copy of the electrical schmatic of the a/c circuit.
Apr 18, 2006 at 12:00 PM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Disconnect the compresor and try it. If the fuse doesn't blow you have a bad coil in the compressor
Apr 18, 2006 at 2:03 PM

Suggested Repair

Disconnect the compressor clutch and engage the A/C. If the fuse no longer blows, the compressor clutch coil is shorted and should be repaired or replaced. Also verify the 10A A/C fuse in the fuse block behind the glove compartment.

Conversation Summary

A 1992 Toyota Pickup lost A/C: the button does not light and the compressor does not engage, with no broken belt and initially no blown fuse. The expert suggested checking compressor coil resistance, system pressures, the A/C amplifier behind the glove box, and the 10A A/C fuse. After the owner found that engaging A/C blows the fuse, the expert advised disconnecting the compressor; if the fuse then holds, the compressor coil is bad.

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