1999 Grand Cherokee Jeep Loredo

Asked by Daboo2 Jul 04, 2019 at 03:19 PM about the 1999 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

My ac blows hot air. Leak
test found no leak.
Compressor is cutting on
and off every few minutes.
Freon leak I know, but
when you cut off the
engine; you here a hissing
sound inside the car.
Where could this leak be
and what is leaking?

2 Answers
42,870

Hornet_2497 answered 4 years ago

If there's no leak, then all you need to do is fill it back up. Some loss over time is normal. The hissing sound is refrigerant (134a) boiling in the evaporator and condenser when the engine is off....pressure drops...things boil. The fact that the compressor cycles, tells me things are running okay, you are just low on refrigerant (low pressure switch is kicking out). With test gauges hooked up, add about one (14 ounce) can and see if it runs well. It should.

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