Joe Knudsen

Let me start by saying I'm no mechanic, not even close so ve gental on me....

so AC is touching hot air ... I have replaced everything I can think of

accumulator
compressor
air lines lines
Belts
bottles and bottles of 134a
go to all the pretty gauges

blows hot still and overheats at idle.... never get cold all gauges read as (youtude tells me these should be)

tech2

-put the gauges note the static pressure (pressure with the system off for 10minutes) and ambient temperature. post results.
-start the engine and run the a/c system; does the compressor run, does the compressor short cycle? turn on for 5-10seconds and then shut off.
-does the high side pressure go over 250 psi pretty fast
-are the cooling fans turning on?

Joe Knudsen

System off blue Line reads 51 red is at 50


The compressor does not run when the air conditioner is on it will turn on the second I turn the air conditioner off

When I turn the AC off the red line goes up to about 125 and blue side drops to 20 and then goes back and sits around 58

Radiator fan is not on and it's the compressor Cycles about every 5 to 10 seconds like you said

Joe Knudsen

Left the air conditioner off which for some reason engages the clutch for 10 minutes attached photo is the gauges at 10 minutes the moment I go into the truck which is still hot and push the air conditioning button the compressor disengages and never turns on also two notes the fan on the radiator does not turn on and the temperature of the engine was around 210 and climbing

Thanks for any and all assistance

tech2

the first thing to address is why the ac is coming on when switched off and why it off when switched on.

how I think it should work is the a/c "on" switch grounds a signal from the pcm. the pcm provides power on the wire to the ON switch...the wire then goes to the pressure switch then to chassis grd...so if you check the wiring at the hvac module c1 connector... pin b11 white wire should have power from the pcm and the a12 dark blue wire should have grd if the pressure switch is closed(its closed with the system charged with refrigerant)



do you have automatic or manual system?

Joe Knudsen

All that is Greek to me I will google in am, see what I come up with

thanks

tech2

find a wiring diagram for the hvac and a/c system

{tpc}

Isn't the clutch just a solenoid that pulls in? I wouldn't think it would be more complex than a power and ground engaging it, and even if it was plugged it backwards, I don't see how it could ever engage?

I wonder if there is a wrong relay in the fuse box or something? Something that is normally closed when it should be normally open? That would explain reverse operation of the switch. As for the fans not coming on...somewhat of a mystery there.

tech2

the fans come on when turned on by the pcm....if the compressor is turning on when the pcm thinks its off....the pcm won't engage the fans.

Joe Knudsen

Ok I have set an appointment with shop for ac

now raditor is leaking from behind fan .... I can't find a hose leaking not sure what is behind the fly wheel (?) But seems to be coming from there