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93-96 Honda Civic a/c problems

Motor Vehicle Maintenance & Repair Asked by Erick Villalobos on January 16, 2021

Alright guys so I’m having a difficult problem with my a/c system. I’m somewhat of a mechanic so il list down things I’ve done to try and fix the problem. But long story short my a/c runs great in temps from 30-60 farenheit. Once the temp reaches 70 or higher my a/c stops running after 30 min. Both my compressor and condenser fan turn off and they do not engage till the next morning when I hop in to go to work. Mornings I never had a problem but in the afternoon when the temps are higher it only works for about 30 min. Things I’ve done to fix the issue are:

  1. Vacuum the a/c system out and fix any system leaks. Refill with correct a/c ounce capacity (around 17-19 ounces)

  2. Replace the binary a/c pressure switch.

  3. Check the a/c fan and condenser fan relays (yes they work)

  4. When the a/c stops working, the low pressure gauge reads over 60 while the high pressure gauge reads only 150.

Your input is appreciated

One Answer

Looks like you have a high low-side and a low high-side pressure. This can be caused by too much refrigerant flowing into the evaporator, so it doesn't have room to expand (which is how the cooling happens).

Common problems for this are

  1. The thermostatic expansion valve is stuck open or the thermal bulb is not sensing the temperature correctly.
  2. The orifice tube opening is too large, or the O-ring sealing the outside of the orifice tube is not sealing.

These are just basic guesses without knowing more about the vehicle.

Answered by PeteCon on January 16, 2021

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