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Discussion Starter #1
When I press the AC switch, the blue light is on but the compressor does not engage. No power to the compressor. Where should I start checking?? Any advice is appreciated.
 

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Get an a/c pro to put gauges on it and see if it has adequate gas then start diagnosing from there
 

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Discussion Starter #3
Get an a/c pro to put gauges on it and see if it has adequate gas then start diagnosing from there
One shop has already checked and the gas is there and no clue to check further!
 

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Ok, if gas is there you need to start checking the control circuit. Do you have a manual with the wiring schematic? It can be many causes, from something as simple as a broken wire feeding the compressor , a faulty pressure switch or a faulty fan switch.

You can try jumping a wire from the battery positive thru a suitable 15a fuse to the compressor to prove it actually runs, dont run it fir long, this is a quick and dirty test to prove the compressor only
 

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Discussion Starter #5
AC diagrams

Can you help point the directions?? Or can you help make them bigger than these??
 

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99 Tracker, 5 door, 2L, 4x4
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One shop has already checked and the gas is there and no clue to check further!
Are you saying an A/C specialist could not diagnose the issue, SHAME !
 

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1998 Chevy Tracker 4x4 16v/1.6l/5spd
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My Tracker AC didn't work when purchased. According to previous owner she never bothered to repair it (a period of 10yrs).

Like you my compressor would not run. I'm an HVAC guy, so I hooked on with gauges. The static refrigerant pressure was below 20psi. I imagine the low pressure safety switch was preventing the compressor from engaging.

I removed the remaining charge, evacuated system with a vacuum pump, and recharged to the manufacturer rated 2lbs.
Now my compressor runs and system cools well BUT my electric condenser fan is seized from not running so long. Now I need to fix that.....
 

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Discussion Starter #8
When it comes to old cars, people seem not want to get headache!!
 

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My understanding of how electrics works is pretty weak, so I don't know how apropos this will be, but some time back, my condenser fan wouldn't kick in, which turned out to be a dead transistor inside the AC Amplifier. Thread here.
 

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Discussion Starter #11
Today I removed the condenser fan and tested it with a 12v battery, it works.
 

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Discussion Starter #12
The problem solved. The AC shop cannot find it they suggested to an electrical shop. Something which is not related to recharging the refrigerant at all, it was purely electrical inside the AC amplifier. They removed the AC amplifier box out and opened the box and then replaced something which is I don't know. Thanks for help anyway!!
 

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The problem solved. The AC shop cannot find it they suggested to an electrical shop. Something which is not related to recharging the refrigerant at all, it was purely electrical inside the AC amplifier. They removed the AC amplifier box out and opened the box and then replaced something which is I don't know. Thanks for help anyway!!
Then it sounds like it was the transistor, same as mine.
 

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That would be the power mosfet
Sadly, I can work a machine in a clean room to make'em, but I don't know their differences.
In any case, here's what was in mine, which should be the same as his. For posterity...
97386
 

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No power mosfets on that board, in fact, no power transistors, just good old fashioned switching transistors, which is really all you need to control a couple of relays.

Now - it appears that some folks have enough of a need to post comments that they are willing to guess incorrectly, I'm noticing this more & more recently, and it is becoming worrisome.
 

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No power mosfets on that board, in fact, no power transistors, just good old fashioned switching transistors, which is really all you need to control a couple of relays.

Now - it appears that some folks have enough of a need to post comments that they are willing to guess incorrectly, I'm noticing this more & more recently, and it is becoming worrisome.
Easy to comment when you can see the actual board,other wisw Yes it would be an educated guess, but there are some with the offending Mosfet, they get rid of the electromagnetic relay that this one may trigger..

Lets not assume that all are fitted with relays especially with newer editions..
 

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"Power" mosfet also come in TO-92 packs, not just in TO-220, and not as highly rated that's all being in the smaller pack.
Without seeing a number on the item you are only assuming what it is.

Third gens certainly use a mosfet block to control fan speed and compressor relay. This old tho, I'd suspect transistors switching relays.
 

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Discussion Starter #19 (Edited)
It was amazing I handed the AC diagram to the electrician. He said no he does not need it! One hand equipped with a small screwdriver with light at the end, he disconnected every coupler from the compressor up to the passenger box. Then reconnected them. At one point he touched one hole of the coupler of the AC amplifier there and the compressor starts working! That is the way he works. He charged 20$. Found the amazing electrician in the city.
 

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If indeed it was a transistor that blew, rather than just replace it, I would like to make sure there is no chance of an over load, which will destine the replacement to the same fate..
 
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