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AC relay and compressor wires.

yorled on Sun October 10, 2010 5:46 AM User is offline

Year: 97
Make: toyota
Model: corolla
Engine Size: 1496
Refrigerant Type: 134a
Ambient Temp: 89f
Pressure Low: -
Pressure High: -
Country of Origin: Jamaica

(1) Where do i find the ac relay on this car?
(2) There are three (3)wires that go to the ac compressor of this car ,one i know that starts it.What is the purpose of the other two?

Dougflas on Mon October 11, 2010 5:44 AM User is offline

If memory serves me correctly, one lead is ground. The other is 12 volts which goes to the AC relay. Off of that lead, 12 volts is applied to the control panel to feed the electric fans.

GM Tech on Mon October 11, 2010 8:51 AM User is offline

Probably the RPM sensor that most toyotas use...are there wires going to the belly of the compressor? if so that's what they are..

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

NickD on Mon October 11, 2010 2:03 PM User is offline

Not much help here either, wife has a 1997 Corolla, Chavez said no to letting her bringing it here. His car is Jamaican, wife's is Venezuelan, but hers is entirely different than the Toyota's sold her, no OBD II for starters, strictly carburetor like something you would find here in the early 80's. Can even open the hood and see the ground, lots of ground. As I recall, her clutch coil only had two connections. I know Toyota was using the compressor speed detector in the 80's, but thought that was dropped in the early 90's. Was more of a PITA kind of thing, belt could squeak like crazy before the detector would switch off the clutch. And completely worthless if your idle pulley bearing seized.

Also thought these were only used on the higher end Toyota's like the Cressida keeping pace with the automotive marketing philosophy, the more you pay for a vehicle, the more problems you will buy.

Kind of recall her relay was under the right hand dash, also some kind of amplifier board near it, but can hear a click of the dual function switch is within range. Apparently, yorled has a problem with his AC, relay and clutch problems may be just a guess. With my wife's car, too close to that southern gulf salt air, evaporator was a corroded mess causing it to lose the last drop of R-134a. Her son is using her car now, just told him to roll down the window. If you think parts are outrageous here, positively insane in Venezuela, like 400 US bucks just to change the compressor drive belt, if you can even find the part. Had no tools, no parts, was helpless.

It's for that reason, really have to be extremely careful where you leave your car parked, better be in a gated security guarded parking lot, or it won't be there even if you come back in five minutes. She had a steering wheel, gear shift, and parking brake locks on her car, would take a half a day to get moving with all those locks. But really don't think they would help. Always nice coming back to this country.

Dougflas on Mon October 11, 2010 5:57 PM User is offline

Doesn't appear to be RPM sensor from schematic. Ac relay is left side of engine compartment. I thought RPM senssor at first until I looked it up. Uses Nipondenso 10PA15 compressor. When you say 3 wires, are you speaking of three separate terminals or 2 terminals with a total of 3 wires connected?

Edited: Mon October 11, 2010 at 5:59 PM by Dougflas

yorled on Mon October 11, 2010 11:52 PM User is offline

The three wires go in and then out of a connector,one which i know is of 12v goes to a terminal on top of the compressor.The other two go to a common terminal beside the first wire.One of the two (2)wires act like an input and the other like an output of their common terminal.

P.S. The first wire has it's own terminal and the set of two( wires) has their's also.

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