AC QUESTION

[Tifton81]

I replaced my AC two years ago this summer and had it converted at the same time to 134A. During the winter months I have always turned it on just to run it and make sure it was still functioning. Last week, I turned it on and it worked for a little but then the fuse blew and I had no AC, fan or anything. I replaced the fuse and it ran again, however, the clutch seems to be engaged all the time and the compressor gets very hot. I thought it might need to be recharged but I checked the pressure on the low side and it was in the red. Not sure what to do next? Any ideas on why it's blowing fuses and running hot?

Thanks

Tifton 81

 

[Sensei]

Did the fuse just blow once and now it is holding? I'm not looking at any manuals, but the fuse for the fan may not service any of the rest of the AC system. Did you check pressure with the AC on max? Are you sure the compressor is engaging? If the car is off, or the compressor is bad or not engaging, the low side pressure will be high. God bless, Sensei

 

[Tifton81]

AC Question

I have replaced the entire Air and Heating control unit in the console and have the air conditioner upplugged from the compressor. When I turn on the car and place the control unit on Air Conditioner position (any of the air positions) it immediately blows the 25Amp fuse in the fuse box. If I place the control unit past the Air Conditioner positions and place it on Vent or Heat and turn it on, it does not blow the fuse and the blower and everything works.

I thought I had a bad switch but I just finished putting on the new one and get the same results. ANY IDEAS WHY THE FUSE KEEPS BLOWING ON THE AIR CONDITIONER POSITIONS?

Thanks

Tifotn 81

 

[geekinavette]

There is a diode, usually integrated into the connector that plugs into the compressor...make sure the leads on that diode aren't touching. That's a common cause of blowing the AC fuse.

Bill

 

[minifridge1138]

When you checked the freon pressure on the low side, you said it was in the red. Did the pressure stay in the red, or did it bounce back and forth between too low and too high?

If it is bouncing back and forth, then the freon is too low. It should remain steady at a pressure between 35-40 (45 is the redline, and I prefer to stay on the safe side).

Mine was too low and it bounced between 15 psi and 100 psi. As I added freon, it started to get (and stay) closer to 40. Finally, it remained constant.

As for blowing fuses, I'm not sure what would cause that.

Good luck and let us know how it turns out.

 

[Tifton81]

Blowing Fuses

Here's the latest. I have replaced the control unit, the conector at the AC comp. and still get the blowing fuses when I place the unit in the AC on position. Does not blow fuses when in the vent, heat or defrost position.

I have uplugged the connector at the compressor and the unplugged the high presure connection located on the dryer to see if it would still blow fuses. It does. Can anyone tell me if there are any other relays between the inside control unit and the fuse box?

Thanks

Tifton 81