Question about 1998 Toyota Camry

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Camry 2.2 automatic, 1998, airconditioning not working

The ac green light is on, the ac controls and fan, climate controls, functions normally, but there is no cooling effect. There is also no indication that the ac turns on/off when running the car idle. Usually I could hear outside the car when the ac turned on. (The car has been working perfectly since 1998, 450.000 km).

I am quite technical, m.sc. electronics and software, so I could to a lot of investigations my self. Paying for good advices is no problem for me :-)

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  • sihelset May 23, 2009

    Ok, I have located the AC compressor, the pipes and a attached a vent with a cap (with letter L) on it. Seems to be the right place, but seems like I will need some special tools for measuring the pressure, or refill fluid R-134A ?



  • sihelset May 23, 2009

    Ok, I will get a refill kit on monday, measure and refill; - if that solve the problem, I will be happy to accept the solution ;-) Otherwise, we have to follow up doing more investigations. Thanks so far, I will keep in touch monday when I get the kit about the outcome. Have a nice weekend!



  • sihelset May 30, 2009

    Greg Margo had a quite good but path to solve the problem, I have not able to implement the solution yet, since it takes time to get those spare parts (refill ac-fluid equipment). However, - we should find a reason for why we are out of ac-fluid. In case of leak, possibly into the cabin, - there is definitely things to check out before proceeding and refilling. I guess I should also check for leak after refilling etc.

  • sihelset May 30, 2009

    OK problem solving guide, but where is the sight glass for cooler fluid/pipe located ?

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There are only two causes for the compressor to not turn on: (assuming is not damaged)

1. there is no cooling gas in the system.
2. the relay is not working.

If there is no gas in the system, you need to chech for any leak wich you are already doing.

But I recommend you to check the relay first, it is located in one of the pipes and it have 2 or 3 cables attached.

Most of the cases when the compressor suddenly stop working is the relay.

And you can find a spare in most autoshops.

Posted on May 31, 2009

  • Carlos Figueroa May 31, 2009

    The relay function is to be sure the compressor only starts when there is gas inside the system.

    You can bypass the relay and if the compressor start then you are sure the relay is damaged.

    Also look for stains along the pipes and all over the panel, the gas leave a really easy to look stain when there is a leak


  • Carlos Figueroa May 31, 2009

    You will need a gauge for A/C, one end goes to the low pressure vent and the other goes to the high pressure vent, the gas canister have to be conected to the gauge.

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If no cool air comes out (even at high engine RPM) then there can be several suspect areas:

1. Refrigerant volume
2. Refrigerant pressure
3. Drive belt
4. Compressor lock sensor
5. Magnetic clutch
6. Compressor
7. Pressure switch
8. Thermistor
9. A/C switch
10.*1 ECM
*2 A/C amplifier
11.Wire harness


Most possibly it is the Refrigerant volume. So inspect the volume. Observe the sight glass on the liquid tube.

Test conditions:
 Running engine at 1,500 rpm
 Blower speed control switch at ”HI” position
 A/C switch ON
 Temperature control dial at ”COOL” position
 Fully open the doors

Camry 2.2 automatic, 1998, airconditioning not wor - 8d17a7a.jpg

*: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling is sufficient.

Posted on May 30, 2009

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Your first course of action is to take the pressue on the low side of the AC line. The compressor won't cycle on without a minimum amount of refrigerant in the system. This is a safety feature installed on most cars to prevent the compressor from overheating and burning out when there's insufficient refrigerant in the system. The less refrigerant in the system, the harder the compressor has to work. Assuming the pressure is low(most pressue guages will show acceptable pressure by going into the green)

  • add refrigerant (R-134A sold over the counter in most auto parts stores seperately or as part of a kit including lubricating oil for the compressor) by starting the car, turning the AC on MAX,
  • attaching the refrigerant (don't turn the screw to puncture the seal yet) and attaching the hose to the low side AC line.
  • Once attached, turn the screw to punture the seal and hold the can upside down and move from side to side. You should feel the system sucking the refrigerant from the can. Once empty,
  • disconnect and take another pressure check or watch for the compressor to turn on and frost develop on the line. If this occurs, cold air should come from the vents. If the compressor doesn't accept the refrigerant,
  • Some compressors may need to be reset prior to adding refrigerant. (in some american cars have compressors that need resetting for refrigerant to be added by disconnectiong negative battery cable for 15 mins and reconnecting) not sure if it applies to your Toyota just wanted to make you aware.

If the pressure is normal and there's no need for refrigerant, the compressor is likely bad and needs replacing. Hope this completely answers your AC problem. Take care and please feel free to post back with any comments or concerns. All the best!
Greg

Posted on May 23, 2009

  • Greg Margossian
    Greg Margossian May 23, 2009

    Most auto parts stores will have an AC pressure guage and the refill kits usually come with the hose you will need to refill the system with refrigerant. There are some who choose not to use the guage and just refill the refrigerant one can at a time but this is risky as overfilling the system can cause damage. You could try to add one can of refrigerant at a time to see if the compressor kicks on. The auto parts store will have both the refill kits and pressure guages. Please post back if this doesn't answer your question or if you have any other concerns.

    Greg

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Have you thought of refilling the gas in the ac compressor. the gas level will also contribute to this.

When car is idle the ac cools lesser than when moving. also watch that hint.

Good luck pal.

Dont forget to rate this solution

Posted on May 24, 2009

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