Hopefully someone can give me insight on this...My AC (1992 SC 300) is not working correctly -- the temp. of the air is the same as if the vents were simply on.

Now, The green light on the A/C button is not blinking (according to the manual, this signifies a compressor problem -- it comes on when the air is turned on, but doesn't blink -- which is good), so I'm assuming it is not the compressor (unless of course there's a problem with the notification light..).
I've checked all the fuses, and none are blown (both the engine panel and side kick panel).

Also, since my car is a 1992, I'm not sure if it uses Freon, or that new environment friendly cooliant.

Hopefully, I just need to have my A/C unit charged, but I'd like to go to the mechanic armed with info and not vulnerable.

Any thoughts would be greatly appreciated. Thanks !

 

Put the system on high heat and mark the position of the push/pull cable on the water jacket metering valve in the engine compartment behind the engine at the top of the firewall, now put the system on "max cold", 65F, and note that the cable travels at least 45 degrees.

As a general rule if the compressor runs then you will have enough freon(92) in the system for some level of cooling. The A/C system is always under some level of pressure if there is enough freon and there is a high and a low pressure switch in the control system. Low pressure switch open, not enough freon, compressor never runs. High pressure switch going to "open" stops compressor.

Good luck.

 

Correct me if I am wrong, but according to your statement above, you have yet to make a definite determination that your compressor clutch engages and turned with the compressor's pulley when you press the AC button. You'll need to do that first before making any assumption. Also, you can use a freon pressure guage to find out if there is freon in the AC system.

 

turn your A/C on, you should hear the compressor click on and off, that's the clutch on the compressor engauging, if its clicking on and off then its probably not the compressor.
For the year of your car, you should have R-12 freon, not R-134a.
IMO you should have the A/C shop put some dye in the system and charge it up, the dye is so that you can see of there are any leaks, usually around the seals and gasket areas.
Hope this helps you out.

Aloha

 

and if you compressor doesnt even kick on? sawry for bringing it up from the grave but our 90 ls acs wont kick in...... the pump made no noise before hand

 

Will,

If your A/C does not kick on, the most probable cause is not enough freon in the system. Check the pressure on the low side with the engine off as well as with the engine on with the A/C on max cold. Engine off = 80+ psi .. engine on A/C on max = 30-40 psi.

If you have pressure, it's either an electrical problem or the compressor itself. If you do not have pressure, pull a vacuum on the system for 10 minutes. Let stand for 10 minutes. If the vacuum does not go down after 10 minutes, recharge your system and enjoy the cold air. If you lose vacuum, there is a leak you must locate and repair.

Luck

 

okay thanks i dont have access to low and high side lines as of right now.... not until next monday at school so ima have to wait it out