Help with A/C

I have an '87 b2000 cab plus. I just converted my A/C to 134a and filled it up with freon. As it did before I did this, it just blows hot air when I turn the a/c on. Any ideas of what may be wrong?

Does ur compressor work?Did u change the drier when u put the 134 in?Is ur flapper working when u turn the ac down so that hot air is shut off?BJ

I'm guessing the compressor works as it blows air at the speed its set at but I may be wrong. What is the dryer? My kit just had a new adapter valve and thats it, no other parts. Whats a flapper valve?

The compressor does not blow the air...the fan does...and you need to change the dryer when you go from r 12 to r134a.... not to mention evacuate all of the old coolant and oil. Oh and it might be that there is too much or too little coolant in the system....soo many things can cause the ac not to work.

and your clutch on your compressor might not be engauging

i just did mine on my 93 fs chevy and i didn't do anything but put the new fittings on and filled it and it works just fine.

Thanks for the help, I'm gonna ask one of the boat mechanics at my dads work if they'll look at it.

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This is very true. A new receiver/dryer can really help your new system out. Plus r134A is allot higher pressure than R12 is. So your system will need less Freon in it than regular (I think its 10 or 15% less) something like that. Anyway, I did an r134A conversion on my system. It works but I have a leak in my evacuator so there’s another headache for me. But the point is that it can be done.

Oh and Mazda weaker has very good points here, It can be very dangerous if you don’t know what you’re doing.

A few tips on charging AC systems with canisters:

Make sure you evacuate the system for at least 20 - 45 mins. check your pressure often while charging your system, never leave a charging system unattended, have your AC on full blast while charging and idle the motor at about 2k rpms, also, never shake cans or hold them upside down while charging. Check the receiver dryer for bubbles. You should see ALOT flowing through there. of you don’t see any you either have a leak or you put too much in. when the receiver dryer doesn’t show any bubbles you either have the right amount of Freon in the system or too much. The way to know if you have the right amount or too much is to have someone shut the AC off while you look at the receiver dryer glass. If bubbles surface as soon as you shut the AC off you charged it just right. If you don’t see any bubbles you over charged. And you need to make sure you take some Freon out before you damage components. Hope that helped out a little. And sorry for the long post haha

didd you remove all the old coolant when you converted