Anyone know how many cans of r132 it takes to fill the A/C? I had the system off of the car ,reinstalled it and filled it up with 1 can and it still blows cold.

 

'92 was R12 with a capacity of 2.25 lbs or 36 ozs or 3 cans. Since R134 has a smaller molecule, you should go about 80% of this number, so add another can and monitor the center vent temp and pressures. 2.5 times the air temp at the Condensor is good average for the high side. R134 freezes at 28 psi. With the gas gaining heat (superheat or the temperature above it's saturation pressure), you can get by with a low side of 22.5 psi which is where you should set the Low Pressure Cutoff. There's a screw between the terminals. Pull the blower motor while it's on high and see where it cuts out (for R12 it should have been set to 25 psi). Turn the screw counterclockwise to lower the threshold - 1/2 turn at a time - retest. Consider getting your fans reprogrammed. With R12, they weren't being driven until the high side was in the 220's. That's a little too high for R134 and having them both cranking at 200 psi will help to keep it cool when it's 90 or better.

 

Thanks ...now im really lost a guy told me yesterday it was 134 now you say r12 so if I put a can of 134 in it is it going to hurt or damage it in anyway?

 

they have a different ports. You can't put R134A into a system with R12 without the adapters.

How did you do it?

 

Than mine has been switched because it hooked right up to the port and went in the system...must just need more.

 

did you pull a vacuum after opening the system?

 

No I didn't. I'm just goin by what I am told on here so...what vacuum should I pull?

 

Don't know how you got anything in it - Your Year uses a Pressure Sensor so that the ECM knows that there's a charge in it and if the voltage signal is 0, it usually won't engage the Compressor.

You need a vacuum pump and a manifold gage set. Pump goes to the center hose; Low to the Low Port and High to the High. Start the Pump and open both valves on your gages. Let it work for about an hour and close the valves, then turn off the pump. The vacuum should hold steady or maybe drop a notch or two while any remaining moisture boils off. If it does drop a point, run it again until it stays steady after you turn it off. When it is, disconnect the pump and put a can on the Center hose. Momentarily crack the charge hose to purge any air. Then open the Low Valve and let vacuum suck in the first can. Close the Valve when the can is empty. Remaining charge goes in with the compressor running. Clear any trouble codes by disconnecting and reconnecting the battery; then put a paperclip across the terminals of the Low Pressure Switch harness connector to keep it from cycling off. Put it on max and prop the throttle so it's running at 1200 to 1500 rpms. Attach another can & let the low side suck in the rest of the charge (same drill - momentarily crack the charge hose to purge air - open the Low Valve on your Gage Set). Monitor the high and low side pressures, center vent temp while both cooling fans are running, engine at 1200 to 1500 rpms.

 

When you had the system off did you leave the hoses hooked up? Did you evacuate the system?

I didn't mean pull a vacuum line off, sorry the slang in this business is confusing sometimes.

You will hook up the pump to the low side with gauges and run it for about 30 minutes. you should be at about 28 " . Stop the pump and see if it drops down. If it holds for about 15 minutes you are good. If it drops you have a leak.

The pump pulls the moisture and air out of the system so you can load the freon.

is it blowing cold when it is hot out

 

Well "suncr" I got it in it with the lil hose and gauge that came with the can..and went and got another can and VIOLA I have cold air now.