New airdog

[KBurgoyne]

My 11 year old airdog died in december. I had it replaced with a new airdog 100 and larry b's full wiring replacement kit. The pump has always clicked on and off while operating, but now it drops the rpm by about 50 when it clicks off. How normal is this?
It also (might be crazy) seems to be interfereing with the ac. I just used the ac for the first time this week, also first time since wiring replacement. Wasnt cold, tried to recharge, wont take refridgerant. The pressure guage on the ac service port climbs to 50, then when the fuel pump clicks, it drops to 0 and repeats. Any ideas before i go crawling around are appreciated.

 

[petersonj]

My 11 year old airdog died in december. I had it replaced with a new airdog 100 and larry b's full wiring replacement kit. The pump has always clicked on and off while operating, but now it drops the rpm by about 50 when it clicks off. How normal is this?

I am a bit confused here. The lift pump turns on and stays on. The AC compressor cycles. Are you referring to AC compressor cycling when the engine drops 50 rpm (which would be normal)?

- John

 

[KBurgoyne]

Ive identified two things. Im pretty sure the ac clutch is dying which explains why its not cold. The main culprit was a cracked stem on the ac control knob. It had play in it and the ac was on low when i thought it was off. This explains the clicking and the rpm drop. Doh! At least its a cheap fix.

 

[KBurgoyne]

Final mystery solved. The floppy pressure guage was due to the low pressure sensor on the ac stopping the compressor from running. The system was too low on refrigerant. Found a good youtube video on bypassing the switch with a paperclip, and it worked. System took refrigerant and is cold again. The black cylinder right of the air filter is the accumulator. The low pressure sensor is plugged into the top.