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Hummer Knowledge Base

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AC Upgrade by Dave Breggin:


Heavy Duty AC Upgrade kit part numbers and contents:

KIT 05744670 Heavy Duty AC Kit, '92-'96 (excluding '94)
KIT 05744668 Heavy Duty AC Kit, '94


The non-'94 kit contains the following:

(NOTE that the descriptions with asterisks are part of the listed kit.)

Quantity Part Number Description
1 05744669 Installation Instructions
1 05744667 Wiring Harness, Fan Control
1 06004055 * Relay, Fan Power
1 05744657 Kit, Fan and Mounting Legs
1 05744656 * Fan, Condenser Cooling
4 05744655 * Mounting Legs, Cooling Fan
1 06003578 Kit, Condenser Installation
4 05743412 * Spacer, Condenser Standoff
4 05744143 * Bolt, Socket Head, 5/16-16 x 2.5"
4 G 02436162 P2 * Washer, Flat, 5/16"
1 05743473 * Receiver/Dryer
3 06006173 * O-rings, #6, A/C
1 06006175 * O-rings, #10, A/C
4 G 00271172 Nut w/ Lockwasher, 1/4-20
4 MS 00090728 6P2 Bolts, 1/4-20 x 3/4"
6 MS 00003367 1 Tie Wrap
1 MS 00003367 3 Tie Wrap

The condenser itself does not seem to be in this parts list, but was in my kit.

Also note in the above parts list, but in my kit was the hose that connects the new Receiver/Dryer to the new Condenser. The connection location on the new condenser is a little different, so the new hose was a slightly different configuration.

The Nuts with lockwashers are refered to as locknuts in the actual procedure. I substituted my own locknuts.

The #10 O-ring in my kit was of an incorrect size, so I had to re-use the O-ring that I took off.

The instructions describe the (possible) need for a temperature overide switch kit, and lists the part number (05743716), but a new switch and harness was included in my kit.

The '94 kit contains the following:

(NOTE that the descriptions with asterisks are part of the listed kit.)

Quantity Part Number Description
1 05744669 Installation Instructions
1 05744667 Wiring Harness, Fan Control
1 06004055 * Relay, Fan Power
1 05744657 Kit, Fan and Mounting Legs
1 05744656 * Fan, Condenser Cooling
4 05744655 Mounting Legs, Cooling Fan
1 05743473 Receiver/Dryer
3 06006173 O-rings, #6, A/C
1 06006175 O-rings, #10, A/C
4 G 00271172 Nut w/ Lockwasher, 1/4-20
4 MS 00090728 6P2 Bolts, 1/4-20 x 3/4"
6 MS 00003367 1 Tie Wrap
1 MS 00003367 3 Tie Wrap


Kit Parts for 1995 Hummer


New Condenser


Old Condenser


New Fan and Dryer


Fan Wiring Harness - splice goes between dryer and temp overide switch


Closeup of New Condenser


Closeup of Old Condenser


Closeup of Mud between radiator and trans cooler


Old and New Fans


Closeup of 1995 stock fan


Closeup of 1998 upgraded fan


Closeup of label on 1998 upgraded fan


New condenser and fan after installation


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