97 A/C help... please

Patfish

New member
Its 100*+ in STL today and on the way home from work, where there is NEVER A/C... I have NONE in the Yota. Check fridge levels, a little low. Add. Still, not even cool air. Sight glass, totally clear now. The clutch engages and disengages every 10 seconds or so. Any ideas? Thanks fellas.
 
Register to hide this ad
Needs more Freon. The low pressure switch is causing the compressor to cycle on and off. is sucking all the available freon from the low side and pushing it to the highside.
 
Needs more Freon. The low pressure switch is causing the compressor to cycle on and off. is sucking all the available freon from the low side and pushing it to the highside.

So, just add more freon? I'm not the most auto-wise mofo....
 
Last edited:
might wanna get the compressor checked. my t4r does thesame thing, blows air but not cold or anything. got itchecked out today and said i needed to replace it soon because the pulley was shot and could seize my motor. $800:gun4:
 
might wanna get the compressor checked. my t4r does thesame thing, blows air but not cold or anything. got itchecked out today and said i needed to replace it soon because the pulley was shot and could seize my motor. $800:gun4:

Not to be ugly or anything but I think you got ripped.

Worst case scenario.

The compressor locks up, burns AC clutch up. Engine still runs.
The Compressor clutch bearing seizes up. Derails belt. Engine Stills run.

So $800 got you a new compressor and installation plus some Freon. My guess is maybe the dealer?

Now giving the excuse that the pulley is shot would lead me to believe that the bearing might be bad and in that case, it is just to replace the bearing. $25 maybe. If the pulley was completely worn out (maybe they mean clutch) so that might be $150. So where is the rest of the money from the $800 go?


The AC is not a mysterious mystical engineering marvel.
There is a pump.
There is an expansion valve.
There is some Freon.

If you have a leak, fix it.

If the pressure is way to high on the high side and way to low on the low side. The expansion valve is stuck shut. (or clogged orifice tube, but 4runners don't have one). Replace Valve

If the pressure is high on the high side and high ion the low side, then the expansion valve is Stuck open. Replace Valve

If pressure is low on the high side and high on the low side, (and you have the right amount of Freon) , then the compressor is worn out. Replace compressor.
 
The AC is not a mysterious mystical engineering marvel.
There is a pump.
There is an expansion valve.
There is some Freon.

This is awesome statement.


So I just add some Freon?
Put it in the Freon tank.

LOL, I don't know very much about AC either. It sounds like what you need is either a friend who knows about automobiles or a trustworthy local mechanic.
 
Put it in the Freon tank.

LOL, I don't know very much about AC either. It sounds like what you need is either a friend who knows about automobiles or a trustworthy local mechanic.

Yep, Just add it to the tank. Just remember that the entire AC system is the tank. The AC system does have a storage tank called an Accumulator - Receiver - Drier. It is usually the cylinder looking thing mounting in line on the ac system. It stores Freon, gives the system some head room, and has a decasent to take any moisture that might have been in the system.
 
Yep, Just add it to the tank. Just remember that the entire AC system is the tank. The AC system does have a storage tank called an Accumulator - Receiver - Drier. It is usually the cylinder looking thing mounting in line on the ac system. It stores Freon, gives the system some head room, and has a decasent to take any moisture that might have been in the system.

Added more freon, same thing. No cool air, clutch engages and disengages every 10 seconds or so. Confusion reigns.
 
With specific details, it is hard to diagnosis. If the Clucth is cycling on and off - one of two scenarios. The switch is both a high pressure cut off and a low pressure cut off.

If the system pressure is too low - The switch will shut the compressor off to save it from burning up.

If the system pressure is too high, the switch also cuts the compressor off to prevent it from blowing a hose or messing the compressor up.

The question is - Which one is your system doing?

If you have some AC gauges, you could see what it is doing exactly.

I would assume that you have added enough Freon (the system only holds 20 oz) so it would be over pressurization causing the high cutoff switch to activate. Bad Expansion valve or bad pressure switch.

If you had AC gauges, you could see the pressure switch working at the right preasure

acswitch.png~original
 
On mine the a/c would work except when in stop and go traffic, it was the fan clutch on the back of the radiator. I bought one from Ebay ($100?) and installed it myselt.
 

Members online

Forum statistics

Threads
278,309
Messages
3,554,067
Members
248,016
Latest member
Advally Service

Trending content

Back
Top