84S manual. A/C has been meat-locker cold for the past year or so. Now, the air is only mildly cold.

1. Lots of bubbles in freon, but could not get any R12 fed in. My guess here is that there is enough freon in the system to prevent flow from the can.

2. Piping that heads through the firewall gets cool when A/C runs. Not cold (after 3 minutes) but cool.

3. I futzed with the cruise control a couple of weeks ago - checked the integrity of the servo unit in the driver's front wheel well. Does the vacuum to this area affect the vacuum of the HVAC system?

Sorry to add another A/C post, but I was hoping to get a suggestion or two to get the cold back.

Thanks and Peace,
Tim

 

Heater control valve not closed due to bad vacuum diaphram?.......... best of luck , made a big difference on my 88. temperorily close it with wire tie.

 

Be careful you are not attempting to feed Freon into the high side port. The low side port is on the right side of the iinner fender well. It should be half way back from the radiator. The port on the dryer is a high side port. It will not feed in Freon becasue the pressure is higher than the pressure in the can. Too much pressure and the can of freon can esplode.

If there are bubbles in the site glass then the system is probably low on Freon. The low side with the A/C pump running will suck in Freon beyond the full point. The procedure generally calls for 1/2 a can more after the site glass runs clear. However, without a set of gauges you will never know for sure.

Harbor Frieght has a set of gauges on sale for about $40. Ther will work both on R12 and R134a, I was able to buy an adapter to connected a can of R12 to the yellow inlet hose. The red and blue houses have adapters for either system. I got the adapter off the Internet. Therea re several sources that sell them.

If the freon is low then you have a leak.

Dan the Pod Guy.

 

With inlet to cabin only getting cool and bubbles in site glass I would say low on freon. The inlet should get very cold. Sounds like there is enough freon to run compressor but efficiently. You can add some dye for uv light check or use a sniffer to find leak.

 

Make sure you are feeding into the correct port. There are two tricks. The best one is to put the can of refrigerant in hot (not boiling) water to push it out of the can while connected. Make sure water doesn't go over the fitting on the can. The other is to spray cold water on the condenser.

 

Yep, low side port near PS fender. Does your recharge kit give you a pressure reading on this? It should be somewhere around 25 depending on temps. The can should have more pressure than that.

 

Another Sharky award needs to go out to Dave McKenzie, with big thanks to everyone in this thread as well. Sure 'nuff I was trying to get the freon into the high side. Once I connected the can to the low side, the freon started flowing and the A/C temp started to go down. I put 12oz of rR12 in - had no gauges.

Thanks so much guys.

I do know that if the freon is down, somewhere I must have a leak. I'll see how the charge lasts before trying to diagnose where that is.

Finally, big thanks as well to the ever-patient Roger Tyson. This guy has spent many minutes on the phone with me and has always given me an ear and great advice.

Now, good Lord willing, I can hit the Highway to Hell with some A/C.

Peace,
Tim

 

I blew out the receiver / dryer on mine (don't ask, my fault). After the repair, the air never dropped below 55 degrees down the highway.

Found out today I also blew a seal in the compressor. Just small enough to allow the system to do something (55 degrees on a 90 degree day is better than nothing, right?).

Screw it, not fixing it before the hell trip.

 

+1

 

he he.. you said blew a seal

 

I'd like to buy some R-12 but am afraid that on eBay I'd get the flammable propane stuff. Anyone know where one can obtain genuine R-12?

H2

 

Try Roger Tyson at 928sRus! I think he's got a small doomsday supply.

 

Let me know how you fix that compressor seal. Mine's leaking refrigerant as fast as I add it.

 

For $15 or so you can get your 609 certification on line and buy freon. I use www.refrigerantsales.com

 

Are the adapter hoses needed to insert R-12 into your system readily available from local sources or just places like www.refrigerantsales.com?

Harvey