Question about 1996 Toyota Camry

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My 96 Camry a/c switch (as well as the defroster)

My 96 Camry a/c switch (as well as the defroster switch) does not engage the compressor clutch. I changed the swithes inside but was not the problem. The a/c switch stays green and does not blink. As far as I know, I do not have an AUTO button for climate control. I jumpered the compressor and the cluch works fine. At the wiring harness plug near the compressor, it appears there is no power at the plug when switch is on. Although the a/c has not work for a long time, recently, it did start working and blew COLD air for a long time. However, once car was turned off, the switch stopped working again. It appears the AC is ok, but must be something electrical going on between the switches and compressor. Also, coolant level looks good in the sight glass. Help...its summer and getting hot.

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  • Eric C. Kohli Oct 19, 2011

    May be a part called an Amplifier I had similar problem this was the cause !!



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May be a part called an Amplifier, The compressor on my 96 toyota Camry was cycling off, there was no refrigerant leak , compressor itself was ok ended up being the Amplifier1

Posted on Oct 19, 2011

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The pressures of the refrigerant must be close or the system pressure sensors will not let the AC cluch pull in. AC is just not wise for DIY without some gauges and knowledge. Sorry.

Posted on Jun 30, 2009


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Bad sqeel or screech w/defrost mode, when compresser is engaged. turned it to just heat it stoped

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Second, a worn out compressor clutch can result in a metal-to-metal contact when the clutch engages. This will cause slipping and squealing.

Third, the compressor shaft could be locked up, so that when the clutch engages, the belt slips over the pulley and squeals.

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Let is start with testing for low gas. (134a freon).Locate the dryer. this is on the passenger side of engine compartment. it looks like a tall cylinder, on the top side you will see a switch. unplug switch connector and jump the two terminals in connector with a piece of wire, this is the low pressure or cycling switch. you will be completing the circuit by jumping a wire across the terminals.If the compressor turns on when connectors are jumped then you are low on gas and the system needs recharging.
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Another test that will help is when you remove the connector from the cycling low pressure switch , test the connector. one wire on the connector should have power when ac is turned on,
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get someone to see if compressor clutch tries to engage when you push the switch in before it starts flashing.the only problems that i have seen cause this are a bad speed sensor in the compressor, loose belt, compressor trying to lock up, wire broken going to compressor, magnetic clutch relay. i hope this will help you and if not give me more info on how,when this started and 4 or 6 cyl............good luck and let me know...........

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Make sure you have the windshield defroster off , the cars computer turns the AC on to dehumidify the windshield as it blows in order to speed the defrosting of the inside glass.
If you have made sure the defroster is not selected on the climate control center , you may try a few other things to determine where your problem lies...
With the vehicle turned off , key out of the ignition , open the hood and unclip the small white plastic plug off of the compressor ( the electric clutch actuator plug). Start the car and see if the clutch is still engaged ...
If it is engaged , you have a locked up clutch on your compressor.

If the clutch disengages when unpluged ,turn the engine off and plug the clutch back in.
I would next determine whether or not the relay in the fuse block is malfunctioning..

The A/C system is more complicated than a switch and a power source .. When you push the button in the car to turn the AC on (or have the defroster on), a signal is sent to the PCM module , routed thru a pressure sensor on the AC coolant line (which has a 5v reference voltage) , back to the PCM where it is determined by the pressure of the coolant (freon) how fast the condensor fans will run , and a relay in the fuse block actuates , sending a 12v signal to the clutch on the compressor.

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