What are my a/c alternatives?

[studigggs]

Converted a ’90 5.7 to R134. Should work for 88 and 89 as well.



High Pressure Switch for Recirc/fresh air valve: 4 Seasons (4S) 35972

Clutch Cycling Switch: 4S 36675

Accumulator: ACDelco 15-1676 GM Original Equipment Air Conditioning Accumulator (Amazon)

Condenser: 4S 40426 6mm Condenser w/ orifice tube

Compressor: 4S 58937 Compressor New /GM R4

Oil: ACDelco 15-118 Air Conditioning System PAG Oil - 16 oz (Amazon)

Fittings: MagiDeal AC Quick Couplers Connectors High Low Side Port Adapter Retrofit R12 to R134 (Amazon)

Flush: Johnsen's 6545-6 A/C Flush - 32 oz. (Amazon)

Flush Tool: Goplus A/C AC Air Conditioner System Flush Canister Gun Kit R134 R12 R22 R410 R404

Vac Pump: Harbor Freight or rent from auto zone.

O-rings: Santech MT2551 A/C System O-Ring and Gasket Kit (Amazon)


Evac R12 (shop), flush, install R134 fittings on old lineset. Drain oil from new compressor (if needed), Install new high pressure switch on compressor, install condenser (add 2oz oil), compressor (add 2 oz oil), accumulator (add 2 oz oil) and lineset. Vac and leak test. Add 1.8 lbs r134A. enjoy

 

[Shorty01GMC]

Get a window unit and a generator from harbor freight...

 

[kv5137]

Converted a ’90 5.7 to R134. Should work for 88 and 89 as well.



High Pressure Switch for Recirc/fresh air valve: 4 Seasons (4S) 35972

Clutch Cycling Switch: 4S 36675

Accumulator: ACDelco 15-1676 GM Original Equipment Air Conditioning Accumulator (Amazon)

Condenser: 4S 40426 6mm Condenser w/ orifice tube

Compressor: 4S 58937 Compressor New /GM R4

Oil: ACDelco 15-118 Air Conditioning System PAG Oil - 16 oz (Amazon)

Fittings: MagiDeal AC Quick Couplers Connectors High Low Side Port Adapter Retrofit R12 to R134 (Amazon)

Flush: Johnsen's 6545-6 A/C Flush - 32 oz. (Amazon)

Flush Tool: Goplus A/C AC Air Conditioner System Flush Canister Gun Kit R134 R12 R22 R410 R404

Vac Pump: Harbor Freight or rent from auto zone.

O-rings: Santech MT2551 A/C System O-Ring and Gasket Kit (Amazon)


Evac R12 (shop), flush, install R134 fittings on old lineset. Drain oil from new compressor (if needed), Install new high pressure switch on compressor, install condenser (add 2oz oil), compressor (add 2 oz oil), accumulator (add 2 oz oil) and lineset. Vac and leak test. Add 1.8 lbs r134A. enjoy

Do these switches need to be changed? It’s working. A I outback originals


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[studigggs]

Do these switches need to be changed? It’s working. A I outback originals


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Only if they are the R12 switches. Clutch cycling (on the accumulator) should stop the compressor when the low side hits 21 psi and kick the comp back on at 42 psi. If the clutch is cycling between 30 and 49 psi, you have the wrong switch. The high pressure switch (back of the compressor) controls only the fresh air vent in the cabin. Should close (ground) and draw recirc air when the high side hits 280 psi, and open (draw fresh air) when the high side reads 210 for 45 seconds.

Cycling switch can be changed with charge in the system (has a Schrader valve behind it). to change the high pressure, you must evac, but since it only controls recirc, you can bypass it.

 

[kv5137]

Where would I test this ?


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[studigggs]

Where would I test this ?


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Probably easiest to hook up some gauges and watch at what psi the compressor cycles. if it shuts off at 30, you ave an r12 switch. if 21 psi, you have a r134 switch.

 

[kv5137]

Ok thks.


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[kv5137]

Clutch engages and doesn’t stop unless I disconnect either switch or turn off the a/c
Sooooo. I’m thinking I have to do hange the switches?

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[studigggs]

hard to say. it could be hot enough where you live that the low side pressure is never getting below 30 or 21 psi to shut off the compressor. Mine usually doesn't cycle when its above 90 outside.

 

[kv5137]

Ok... was checking the clutch all was working well... truck was running for around 10 min was about to change the switch at accumulater. Noticed the green slime leaking at the compressor hose connections.... so I went to tighten it after turning off truck and it popped.... literally touched the nut and it popped off. Freon and slime all over... well cleaned it up. And changed switch at compressor and attempted to tighten bolt but no go..


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