Toyota (95) 4Runner A/C Experts

[drive-ability]

95 4Runner, :awais:

My 4Runner has a odd A/C problem. First off when it works it's great in the hottest weather it blows real cold, blower motor works well.

The system just stops blowing cold air, it does blow air, just not cold.
I can look at the tack when I turn on the A/C the rpm increases a bit, the compressor clutch engages and the compressor is locked and turning fine. Belt is also tight and with no issues. The A/C pusher fan comes on as normal.
The odd thing is theres no heat being produced at the condenser and surely no cold air. The engine normally reacts to the load of the A/C compressor and the idle rpm stabilizes, but now since theres no load or resistance encountered the idle rpm with the A/C on is about 100 rpm higher. Now surely the EFI sees the A/C request and raises the engine rpm but since theres no load it stays elevated.

My best guess is there is 1. some sorta of expansion valve thats skewed open or
2. The compressor internally is bypassing the pump stage.
What do you Toyota A/C experts think??? John

 

[Klez]

My wife use to have a 95 many years ago and the expansion valve was bad on hers. The AC worked great until she left work and it was hot out side. They only way to tell is put some gauges on it. Although you could just be low on freon causing the evaporator to freeze. Next time when your AC stops blowing cold turn it off and use the vent for 5-10 minutes. If your AC starts blowing cold again this could be you problem. AC always blows the coldest when it's low on freon.

 

[TSP-MIKE]

Does it blow cold at all when you first turn it on? If not then you are low on freon, which means you have a leak somewhere.

Mike