134A A/C Retrofit
Mustang's A/C is not working?
There are new Kits available at auto parts stores that will convert your
existing R12 refrigerant system to the new 134A. This will only work if
your current R12 system is fine but needs refrigerant.
you have comments please E-mail me at:
I have just Used a $49 Retrofit Kit(that I describe here) on my GT & it
works great! I had hardly any R12 left so compared to the $180 cost to put R12
in I went for the new stuff.
Warning it is Illegal in the USA to expel R12 refrigerant into the atmosphere,
you must have a certified A/C specialist remove it...
First you must determine if your A/C is not working due to Low Refrigerant or
- Some other reasons are: compressor failure, bad pressure switch, or leak.
- Usually A compressor that engages on & immediately off, or not at all
is an indication of low pressure.
- Get a pressure test (how much R12 is left?). If you need to add more than
half capacity you might consider the 134A.
- If you only need a little R12 then Adding R12 may be your best choice.
what the cost of adding R12 would be (its very expensive)
Compare a usual R12 fill up at about $180.
To: the retro kit (includes everything) at about $49.
The cans of 134A also sell for $5.99 each for future fills.
Info on the Refrigerants:
-R12 came in all A/C's from the 70's to about 93 (check your manuals).
-R12 is a CFC known to damage Ozone Layer, Its getting harder & more
$$ to get.
-R12 can only be removed, purchased or added by a certified Professional.
- Refrigerants are not compatible with each other!
-134A is a new Environmentally Friendly refrigerant that replaced R12
-134A Runs at higher pressure that R12, use 85% of what is recommended
-134A's Molecules are smaller than R12, it was thought that it would pass
through R12 O-ring. (ID, the manufacturer of the Retro Kit states that
this is not a problem due to the O-rings absorption of (r12)oil during
its years that block the smaller R134A as well.) If you have a new R12
system you may have to change O-rings.
-134A O-rings are Green colored
on the Retrofit:
- 87-93 Mustangs have Large compressors that will handle the higher 134A
- You must have the system emptied, (buy certified..., you know)
- A/C system does not have to be opened or touched in any way other than
removal of R12
- Get the kit(box) with adapters, hose, 3 cans of 134A, and oil.
-The 134A Retrofit kit uses Ester Oil which is compatible with R12 oil.
(Again, you must remove all R12, but even after removal of refrigerant
some old oil will stay in system).