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If I am not mistaken the high/low pressure/temp switch controls the compressor not the fans
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Rear fender condenser to Red Dot install thread
- Thread starter Coug
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So the trucks that have these factory installed use the passenger side condenser for the AC built into the dash/heater core area. The driver's side unit is for a rear AC that sits between the rear seats on a 4 door truck. From what I can tell they are both run to a single compressor, so if you only have one AC unit in the truck it doesn't matter which you use.
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That I'm not sure of. I know from watching the manifold during filling that when the fans on the condenser kick on, the pressure drops, as the refrigerant is a gas in most of the system. Temp/pressure are directly related for gases. I couldn't tell you if it controls the compressor or not, but I was under the impression that unless pressure gets too high the compressor is always working.
so how did your install go? my fender condenser is on its way, i have a new redot kit which i am planning on installing
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Install all complete and fully functional.
Not the cleanest of installs. I have little interest at this time of pulling frame rails and running hard lines, so it's hoses all the sway, and one got a little close to the exhaust so the outer layer is melted a little.
I also never actually measured my refrigerant. I just watched the sight glass in the receiver/filter assembly, and stopped adding it when the glass was clear and the fans weren't cycling too often.
Other than that, I was in 75 degree weather yesterday, had the AC set to slow and the heater on full blast. Occasionally kicked it up to medium speed on the AC, but it does an excellent job of cooling.
I need to verify, one of the condenser fans doesn't seem to be moving much air, not sure if it's just being slow or if maybe it's wired backwards, or whatever. We're past the heat for the year up here (might be into the low 80s a few more times but that's about it I think)
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Red dot kit gets 3.5lbs of r134a.
you don’t you don’t have to remove the body to add hard lines, at least not OEM hard lines.
you don’t you don’t have to remove the body to add hard lines, at least not OEM hard lines.
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My evaporator says on it 4.0 lbs, was a 2 man cab.
- 4,389
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I’m just quoting the red dot install instruction...never seen 4lbs.
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so my mistake. It actually says "4 lbs MAX OPERATING CHARGE" not that it's actually supposed to be 4 lbs.
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yea, the amount of refrigerant is based on ambient OAT, so that’s the max, I’ve been going 3.5 from the book.
but the book has a different part number for the evaporactor, so maybe that makes a differenc.
better too low than over charged, as long as your high pressure switch does not kick off, your fine.
abfisher1798
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Do you have any photos or a template of where you mount the condenser bracket? Or any other reference material?
Thanks.
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no, I don't have any type of template for this unfortunately, it would have made life easier.
I mostly went by the pictures on this page:
Hopefully someone with better info can chime in.
How I finally decided to start drilling the holes was holding the condenser up in place with some sticks/posts, then put the bracket where it needed to be.
Marked where the holes were (or at least one of the holes, I don't remember if I could reach all of them) and then drilled up from the bottom with a small bit. Drilled again from the top with the proper size bit.
I don't remember if I cut the holes for the vent in the fender before or after, but I am pretty sure it was before. Rear of the cutout was along one of the bends in the metal, so was easy to start with, then just aligned everything from there.
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I really wish I had had those pictures with the measurements before I started cutting and drilling on mine. There is at least one extra hole drilled in the top rear of mine than I actually needed (but I think that was due to the incorrect bracket I received at first)
Do you have the measurements for the rear holes as well?
abfisher1798
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That's great! Thanks very much!
abfisher1798
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Thanks very much!
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So I've seen a couple questions on facecrook about manuals for the HMMWV red dot system.
I'm tired of going through my bookmarks every time I want to share them, so I'm going to link them here instead, as I usually end up linking this thread anyway.
Red Dot Parts catalog. The main difference in the diagram of the Red Dot civilian system and the military system is the military system uses size -12 hose, where the civilian system uses -10. No idea if it makes any real different, as the fittings go from -12 hose to -10 for the compressor and evaporator, but thought I would point it out anyway.
Red Dot Service Manual. Does not specifically cover the military unit, but has a lot of good information in it.
I'm tired of going through my bookmarks every time I want to share them, so I'm going to link them here instead, as I usually end up linking this thread anyway.
Red Dot Parts catalog. The main difference in the diagram of the Red Dot civilian system and the military system is the military system uses size -12 hose, where the civilian system uses -10. No idea if it makes any real different, as the fittings go from -12 hose to -10 for the compressor and evaporator, but thought I would point it out anyway.
Red Dot Service Manual. Does not specifically cover the military unit, but has a lot of good information in it.