to anyone running a truck ac bracket
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I have notched my compressor bracket with no issies, but how do you connect the red plug?!?!?!?
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Re: to anyone running a truck ac bracket
Thats the High Pressure cut-out switch, Not used on swaps.
You can run a Trinary on the a High side line..... http://www.oldairproducts.com/catalo...ch-p-2754.html Use a Relay for the fan, The diagram doesnt show one but is necessary. The Trinary switch is a 3 function switch. It Protects the system from excessive high or low system pressures plus it will automatically operate electric radiator or condenser fans as needed for maximum sytem performance. Trinary Safety Switch Pressures: LOW is OFF @ 28PSIG - ON @ 29PSIG HIGH is OFF @ 454PSIG - ON @ 369PSIG FAN - is ON @ 227PSIG - OFF @ 185 PSIG |
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i dont know much about this, but I would like to know exactly how that work, sense I plan on doing A/C at some point
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I have old air on my truck with the LS swap. Clinebarger did my AC stuff for me, since I havent a clue. My Trinary switch is right at the condenser, I dont think it matters as ling as it is on the high side, however, when I installed my Old Air kit, they said put it near the condenser. PM Clinebarger if you have further ?'s
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thanks guys, this is very helpful info...
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Im not Clinebarger, but I will try to help...
yes In your current setup if the PCM is controlling the fans for coolant and you add this switch then either or both will cycle the fans. The PCM will only turn on and off with coolant temp and the trinary will cycle on and off as necessary for the AC based on the pressures previously posted. Just make sure you are tapping the trinary into the correct relay circuit for the cooling fan (should already be there if the PCM is controlling the fans) Quote:
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This is good info getting ready to do a/c also. Can someone post a wiring schematic for the trinary to the fan that's already controlled by PCM. Maybe Cline can chime back in on this thanks.
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It t was then that he realized that the condenser also needs airflow and not just the radiator.....doh :dohh:
So to add to the diagram: pin 87 of the pcm relay and pin 87 of the trinary switch relay will both be hooked to the hot wire on the fan? In the interest of pursuing alternatives: could I not just wire my a/c signal on wire (clutch hot wire) to pin 86 of the additional fan relay and forgo a trinary. I believe this would turn the fans on any time the clutch was on. Since the PCM gets a A/C power signal and controls the clutch....could the fans not be programmed to turn on with the clutch with no additional mods? Thanks for all the advise and patience. I'm just trying to fully understand my options. |
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If you got a R-12 "tube & fin" condenser or the shroud doesn't fit the fan right.....Your going to have problems. As a matter of fact I run a Mechanical fan on my Burb. |
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As an aside: Will this compressor block work on my compressor? The links all say R4/A6 rear mount and the pad face looks to be perfectly flat. My compressor is off a 2001 LQ4 and I thought the original pad face would have a slight offset. Thanks again everyone. |
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Also: Clinebarger your knowledge never ceases to amaze me. You have to do some of this stuff for a living... |
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That manifold may fit your HU6, The O-rings will not work....You will need sealing washers...You can even use thicker sealing washers & pilot extensions to step the sealing surface down if needed....http://www.sosmetalproducts.com/cata...s/l/171618.pdf I have the 65 piece kit. Color codes...http://www.4s.com/Upload/Four%20Seas...%20SEASONS.PDF Yes, I do this for a living, Air conditioning & Automatic transmissions have the highest profit margins IF you know what your doing;) |
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Re: to anyone running a truck ac bracket
Subscribed. But I'm not running electric fans. I am using the stock 6.0 fan with the stock 72 GMC fan shroud.
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Great thread! Subscribed.
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Re: to anyone running a truck ac bracket
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Just came back from getting my compressor charged and I've got an issue. I've got my compressor clutch wired in with the trinary switch inline, but I'm not getting a signal on either side of the trinary switch. I've check and the A/C relay is not getting grounded by the PCM on pin C2-43. I suspect the culprit is the missing high pressure sensor supposed to be on pins C2-14, C2-57, & C1-45. I have a plug in my harness for the sensor, but there is no way to hook it up because of my engine stands. Is there a way to "tune this out" or "sppof" the PCM into ignoring the sensor? It doesn't look like a switch that I could just bypass of a potentiometer that I could just use resistors to get around, so I'm lost. As always thanks in advance for the help.
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Clinebarger did my rewire and Ac repair, what a mess I had. Now my truck rolls down the road with Ac on or off at 190 degrees in our lovely Texas heat. He knows what he is talking about, he does these swaps everyday.
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Cars (4th gen F-bodies) do have a pressure sensor mounted on the Liquid Line. Using this the PCM was able to control head pressure with the cooling fans. I'm guessing your running an F-body OS/segment swap to run electric fans. This will prevent ECM controlled compressor operation if no pressure reading. Also....If the harness is early truck....There is not a 3-pin pressure sensor plug, Only a 2-pin high pressure cut-out switch plug. This is my opinion.....Run the compressor control wire straight to the aftermarket Trinary then to the compressor & bypass the ECM all together. |
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