AC Compressor
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New User
Joined: Aug 2018
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AC Compressor
The AC compressor was bad on my 97 f150. After changing that, I vacuumed it out, and then tried charging it up with the truck running. While trying to charge, I can hear the compressor kick on and off, but no freon is getting into the compressor. The air blows warm. I'm not exactly sure what I'm doing wrong.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
what I have always done is connect the bottle onto the LOW side fitting.. DONT START THE TRUCK. Open the bottle and let all of it flow into the system. You turn the can ( 12- 16 oz) upside down to get everything in..... Measure the pressure on the LOW and HI sides... Should be 80- 100 psi ( roughly).. If not, add part of another can..... Now start the truck and engage the compressor. The LOW side pressure will go down to approx. 30 psi and the high will approach 200 psi... Now add as needed depending on the ambient temp ( that determines the pressures).
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
To the above, why would you invert the can and add liquid to the low side? You want to liquid charge high side only, liquid charging low side will slug the compressor and also wash out the oil temporarily.
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Open BOTH ports when doing the initial charge into a the vacuumed system, it goes a bit faster.
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