Air Conditioning
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Farm, If the clutch is not coming on be sure to check the air gap...should be around .015 or smaller without rubbing with the AC off. You can measure the air gap or turn on the AC and smack the clutch with the plastic end of a screwdriver ect. If the clutch comes on you found your trouble. A new clutch will not be needed, just remove a shim from under the clutch 
. This is a common problem for older units or units run in dusty/dirty conditions.
. This is a common problem for older units or units run in dusty/dirty conditions.
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Postmaster
Joined: Jan 2004
Posts: 3,207
Likes: 0
From: Kearney, Nebr
Not a problem TJ.
I turned on the ac this afternoon and didn't hear it come on. I looked at the two electrical plugs and they checked out.
So should I start with this low pressure switch? I'm thinking that she has a leak though...
How expensive are ac gauges? I doubt its economical for me to pick some up. I'm gonna ask around and see if I can find some...
I turned on the ac this afternoon and didn't hear it come on. I looked at the two electrical plugs and they checked out.
So should I start with this low pressure switch? I'm thinking that she has a leak though...
How expensive are ac gauges? I doubt its economical for me to pick some up. I'm gonna ask around and see if I can find some...
Hotshot
Joined: Aug 2006
Posts: 10,764
Likes: 39
You can bypass the low pressure switch with a jumper wire to see if the clutch engages ..
If so , you may only be low on refrigerant ..It is available without sealant ..add a can (or two) & see what happens...
If so , you may only be low on refrigerant ..It is available without sealant ..add a can (or two) & see what happens...
Elder User
Joined: Jun 2006
Posts: 750
Likes: 1
Bypass by jumping out the low pressure switch. Just use a jumper wire or soemthing of the similar.
Far as preferred brands of refrigerant, just make sure its the 134a.
Far as preferred brands of refrigerant, just make sure its the 134a.
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Postmaster
Joined: Jan 2004
Posts: 3,207
Likes: 0
From: Kearney, Nebr
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Joined: Nov 2007
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The A/c Wasnt Working In Mine And I Re-charged It Last Summer And Only Lasted 2 Weeks Then Got Warm Again So I Tried A New Sealer That Advanced Auto Parts Sells That Seals Rubber Leaks And Metal Leaks And It Has Been Blowing Cold Now For 3 Weeks And No Problems Yet.
Elder User
Joined: Jun 2006
Posts: 750
Likes: 1
I can tell you this though, Jump out the compressor forcing it to run. If it runs, you know your open on the low presure (low on charge.) Somethin they taught me back in the school days.
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Postmaster
Joined: Jan 2004
Posts: 3,207
Likes: 0
From: Kearney, Nebr
Ok. A lot of good information on here. Hopefully tomorrow I can bypass the switch and go from there.
Should I be able to hear it click on from the cab with the windows down?
Should I be able to hear it click on from the cab with the windows down?
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
Farm there are two switches on the AC system. I have a hard time remembering which is which but I am pretty sure the high pressure cut off is on the back of the compressor and the low pressure switch is on the accumulator/dryer by the heater box.
Lead Driver
Joined: Mar 2006
Posts: 5,111
Likes: 1,549
From: western SD
The low pressure switch is located on the accumilator, the big can looking thing by the heater box that has two tubes running to it. Unplug the wire from the switch and jump the two wires in the harness. If the compressor runs when connector is jumped, but doesn't cool the freon charge is low which is most likely. If it cools when jumped the switch could be bad. Hope this helps Tom
Posting Guru
Joined: Sep 2004
Posts: 1,096
Likes: 2
From: Ohio
The switch that actuates the ac unit is the plug in between the pulley and the ac unit. you will see the two metal lines that run into the back of the unit, on the line block, you will see a small sensor there with a wire harness going to it. This is the piece that acutates signal due to pressure. These go bad occasionally also.
If anyone needs one, I hav e a switch here in my shop.
If anyone needs one, I hav e a switch here in my shop.