Question about Heating & Cooling

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1985 toyota Camery in hot weather the car AC quits and will not engage the pump. After it cools the pump will come on again. When this happens the AC button in the car blinks. i know this is a vacuum and/or temperature sensor but i don't know which one it is. The manual I have does not say anything about it. Other wise the AC works just fine. Ron

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  • Ron0293 Sep 27, 2008

    When I first turn it on the AC is working fine, blowing cold air all the time, the clutch pump is in gauged...when the problem occurs the clutch disingauges and then no cold air..

  • Ron0293 Sep 27, 2008

    When I first turn it on the AC is working fine, blowing cold air all the time, the clutch pump is in gauged...when the problem occurs the clutch disingauges and then no cold air.. It is a sensor somewhere telling the pump to turn off.

  • Ron0293 Sep 28, 2008

    there is nothing wrong with the whole AC system when the compressor is pumping! no holes, no leaks, no heater problems or fan problems. The compressor keeps cutting out when the temperature starts to climb. I believe the system has a motor vacuum load/temp. sensor that cuts the AC out when the motor temp. rises from extra load. IE: like going up a long hill. I just don';t know where the sensor is located and the clutch wiring from the compressor is impossible to follow, as it is buried in a wire harrness.

  • Ron0293 Sep 29, 2008

    There are two fans located at the rear of the radiator. They don't seem
    to be running when the AC pump cuts out. There is a sensor switch on
    the dryer. when the pump is acting up if i disconnect the sensor wiring
    the fans start running on high. There is also another sensor on the
    pump and when i disconnect it the fans start running on high. replacing
    the wiring returns the fans to off.
    There is also a sensor, seems to be internal on the pump and when I disconnect it nothing happens.


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Hello ron,

let me explain.

your ac is working fine until the ambient temperature rises.

i am thinking two things or maybe said it is a 1985 camry?...i am not sure if that year the compressor has this thermal overloads that cutoff the compressor coils as the compressor overheats.

compressor overheats because of lack of oil, over worked because of high pressure which is normal at high ambient, or mechanical problem with the compressor to make it overheat

this thermal cutoff is located sometimes at the top of the compressor or at the rear of the compressor. look for a part with two wire in it and the other wire connects to the coil of the compressor.

another theory is that the high pressure switch is being triggered by the high pressure due to high ambient temperature.

that is normal. that is what it is supposed to do. either deplete some gas so that it would not trigger the pressure switch or we look for the reason why the pressure is getting too high.

do you have auxiliary fan in front of the condenser?..and is it running? or do you have two fans at the back of the radiator?...are they both running when you turn the ac on?...

let me know in order to help you further...use the ask me button so that you won't be confused who is answering you.

tnx 4 using fixya,


Posted on Sep 28, 2008

  • francis rivero Sep 29, 2008

    hello again ron,

    i dont know if you are answering my questions but it would greatly help us communicate if you could address us by using our names in giving comments. you do nut know but the set up with fixya is that you could only see one solution whereas we as experts could see all of the solutions the other experts gave. so there is confusion between us whom you are refering your comment to.

    anyway, just to inform you further,

    normal ac operation:

    1 switch ac on, compressor runs, two blower runs at low speed.
    2 if the switch of the dryer is triggered, meaning it detects a high pressure, it would turn both fans at high speed.
    either temporarily ;
    a.) i say temporary untill the pressure goes back to its normal level and turns the blower to its normal speed.
    b.) temporary if the thermostat would cutoff the compressor,( room already cold ) then pressure would go down, fans will turn off, and wait for the compressor to turn on again. if it turns on, it will run again at normal speed since the pressure is still low.

    or permanent. as long as the compressor is engaged, the fans will continue to run at high speed when the pressure of the dryer does not go down to its normal level . why it woud not go down?

    a.) ambient temperature is really high.
    b.) overcharged with refrigerant.
    c.) dirty condenser, clogged with dirt and leaves, anything.
    3. if thermostat is reached, compressor will cut off, fans will caut off too.
    4. if thermostat is triggered, compressor will run again with low blower and repeats its cycle.

    question; how many wires are there in the pressure switch in the dryer?
    how many are there in the compressor?( the one when you pull triggers the fan)

    let me know again, to continue trouble shooting your problem.




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Please check out the ventilations as something would be blocking the cooling line.OR there will be a minute hole in the cooling line so the ac starts for sometimes and then stops as the air gets leaked out from somewhere.

If the AC unit has a condensor check its pressure and make sure that it is working properly with the unit, I.E. condensing the warmer coolant quickly back to a useable form, otherwise recharging the refrigerant is pointless. Also, check your heater valve. It could be that your AC is working fine but when your vehicle gets warmed up then you're heating your nice cool air before you get a chance to enjoy it!

One reason is engine overheating - check your temp gauge and coolant as a first step.

Posted on Sep 27, 2008

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You have several sensors for the a/c system. if the system is running fine and cut's out chances are that it's not a sensor issue i believe that the clutch relay is weak and won't keep the contacts closed so just repalce the relay and this problem will go away. generally if the sensors detects either a blockage or a loss of pressure then the a/c will go on then off with in seconds not when it's been running. please rate the solution.

Posted on Sep 27, 2008

  • Ronald Mueller
    Ronald Mueller Sep 27, 2008

    incidently the post of namizhka is not even close. the fans have nothing to do with the condensor and as far as the evaporator core yes it's a good idea to keep it clean,but has nothing to do with the a/c clutch operation.

  • Ronald Mueller
    Ronald Mueller Sep 29, 2008

    according to the information you are giving me it is the expansion valve that is the prblem this regulates the a/c system this is located near the evaporator core under the dash. replace this and things should be ok from there


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Posted on Sep 27, 2008

  • Zander Rovic Ocampo
    Zander Rovic Ocampo Sep 27, 2008



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