Fuse for air conditioner??????

[jackhartjr]

Hi folks, is there a fuse for the air conditioner? I have not looked, however wanted to see if anyone knew.
Went to add freon and then noticed the a/c clutch was not on.
Thanks in advance.
Jack
PS...1993 vert.

[ManicMechanic]

The compressor won't come on if the freon level is too low.

[jackhartjr]

Is there a way to get the freon in to the point it will come on?
Thanks
Jack

[RobertISaar]

my system was down to ~10PSI(PCM will cut it off around 40PSI or lower), i pumped in as much as i could with the engine off(just until i couldn't hear it coming out of the can), then started it and turned the A/C to max, compressor kicked on, after some more filling the cooling fan kicked on and off until i had a decent charge in it and it stayed on until i shut the a/c off via inside the car.



i guess, long story short, you SHOULD be able to feed enough refrigerant into the system without forcing the compressor on for it to come on by itself.

[jackhartjr]

Robert, I tried what you said and got one can in, and it is starting to feel cooler. I have one more can, I will try to put in in tomorrow.
Thanks again for the information!
Jack

[RobertISaar]

if you were down to the point of having the pressure be below what the PCM will allow for compressor engagement, i can guarantee you need all of the second can, if not more.

do you happen to know why you had low pressure? it doesn't just leak out on it's own.

[jackhartjr]

I've had the car for about 8 years, I am not sure that it was ever cold and I have not driven it for about three years due to the condition of the top. I am wanting to drive it now, the air would be nice.
I have to tell you Robert, it was a sweet sound when the compressor kicked in!
Jack

[jackhartjr]

Which begs the question, can I put too much in? I seem to recall with the R-12 system, it would go to full and not accept more from the cans. Is that correct?
Thanks
Jack

[RobertISaar]

you CAN overfill the system, and trust me, you don't want to do that, you'll start blowing out seals. i think i killed my compressor case-half o-ring that way.

when you do start overfilling, your system will actually become less efficient as well(the evaporator will get warmer).

[jackhartjr]

Thanks Robert, I appreciate the reply. With the one can it went from nothing to where you can just feel some cool. I think I will try to put the last can I have in and see how it cools. May be enough, if not will go for one more can.
Jack

[RobertISaar]

i'm not sure if i would try a full 3rd can. are you pumping in R12? if you converted to R134a, then you should put in roughly 10% less than the original charge of R12 according to some of the retrofit manufacturers. since it originally used 2.25 pounds of R12, that's basically 2 pounds of R134a. the cans i buy are 12 oz, so you're roughly at 24 of 32 ounces needed, so half a can, if you could somehow measure that, would be perfect since it sounds like your system was at or near empty when you started.

[jackhartjr]

Not retrofitted to R134. I put the one 12 oz can in, will put the other in. That may well be enough. Good to know it was 2.25 lbs of R12.
Thanks again!
Jack

[RobertISaar]

so i take it you're using Freeze12 or something like that then?

[jackhartjr]

I am using the original cans of R-12.
Jack

[RobertISaar]

ah, so even more expensive if it leaks then.