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Power Strokes
7.3 Tech
I need some AC help...
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[QUOTE="Tree Trimmer, post: 63911, member: 716"] part of your issue is the two sensors you have bypassed. the system works kina like this. your compressor compresses the freon onto a rediculously small orifice. it travels through that and then "flashes" (think rapid expansion from tiny orifice to large tube) out into a larger tube. when it flashes is when it gets cold. when the pressure goes from super tight orifice to less pressure in the larger tube. there are two sensors. one is a low pressure clutch cycle switch and a high pressure switch. both of those are needed to maintain very specific pressures inside the system. to much pressure your ac gets hot, not enough pressure your ac gets hot. when you add freon to a system, you need guages and some sort of a monitering device to determine how much is in there, and how much you put in. to do it your self, you need more guages. if you over charge it you will lose some cooling, under charged, obviously you lose cooling. my truck, E99, used 2 lbs of freon. thats what the book called for. you can go to a ac shop, and they can recover the freon you have in it, then evacuate the system, then put the freon back into it, +/- to make it right. we had to evacuate my truck twice before we got it all out. thats normal. sometimes it takes once or twice to get it all out. the orifices i was talking about earlier is what freezes. when your driving down the road a bit, and your ac on full blast, pull over. by the blower motor, is some silver tubes for the ac. look at them and see if there is frost on them. if there is, that is one orifice that usually freezes. if you have "outside air" inside your system it freezes the moisture in it and it cannot pass through the orifices, thus blocking the system. that orifice costs approximately $1. yes, that cheap. but you have to open the system to get to it, pull it out, looks like a pencil kinda, and put back together, and recharge. it is a pita to get that orifice out. 200k on your truck, the air gap might me a little loose. take the pulley off the front of the compressor, and take approx 15-20 thousandths of shim OUT, and put back together. i am not a ac guy. im a tree trimmer. but i just got done talking to a shop couple days ago about why my ac is not as cold as it used to be, and those are the cliff notes of a 45 min conversation. hope they help. [/QUOTE]
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I need some AC help...
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