Question about Heating & Cooling

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1994 corolla-I charged the air cond., and it was cooling fine. After about a mo., it was not cooling very good. I assumed it had a small leak. I put my guages on it and the low pressure was running 15 to 20. The high side was reading about 150.I put a can of stopleak and detector in it. Then I put a can of freon in it. While I was putting the freon in it the pressure started to drop on both the low side and high side. Now the low side pressure is running about 15 and the high side is running 0.What happened?

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Thanks for using FixYa. This has happened because of the low side pressure on your AC pump isn't kicking on, because when the pump is off, the pressures equal out and the low side shows a high pressure. But when you kick the pump on you should see the pressure drop. Check if your a/c pump clutch is kicking on. You can uaually hear it click when it is activated. Please follow this procedure to recharge the AC on your corolla--
Requirements for Recharging the system--

  • Look at the air conditioning system for damage or leaks. Leak detection kits that will help you to find leaks in the system and possibly seal small leaks should be available at your local auto parts store. If you see any visible damage, replace the components or repair the leaks before you recharge the air conditioning system with refrigerant.

  • Find the Low Pressure Side port. You can find this under the hood of the car. It is near the air conditioner compressor. The location will vary with engine size and year model. In most cases, the port is near the firewall. It has a black cap that is sometimes marked L. Remove this cap.

  • Figure out if your car uses R134 or R12 refrigerant. You will notice screw type connectors on the both the High Pressure Side and Low Pressure Side lines in models using R12 refrigerant. Models made in or before 1995 may use the old R12 refrigerant. If this is the case, you have to retrofit the Corolla air conditioning system to accept R134 refrigerant.

  • Check your air conditioning system pressure using an automotive air conditioning pressure gauge. Keep in mind that in order to get an accurate reading, the air conditioner has to be turned on the coldest setting with maximum blowing power.

How to Recharge the Air Conditioner---

  • Read all of the directions on the refill kit. Some kits may have specific directions that you must follow to ensure safe use.

  • Hook the refill hose up to the connector on the Low Pressure Side of the air conditioning system. The Low Pressure Side connector is smaller the High Pressure Side connector so, the refill kit hose should fit only on the Low Pressure Side port.

  • Hold the can of R134 refrigerant upright and allow the air conditioning system to suction the refrigerant out of the can. This may take as long as 10 minutes.

  • Use more than one can of refrigerant if the pressure is still low after the first can is empty.

  • Close the valve on the refill hose and release the hose from the connector when you have finished recharging the air conditioning system. Make sure that you put the cap back on the port.

  • Let the air conditioner run on the lowest temperature and highest speed for at least 20 minutes. The refrigerant will circulate throughout the entire air conditioning system during this time.

Please do rate the solution and revert for further assistance.


Posted on Sep 28, 2009


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