A/C troubleshoot question

[HRDROKN]

I've been steadily working on my A/C as it hasn't been charged since the motor swap. I installed a new dryer, replaced the seals and charged her up with DuraCool. I ran the compressor by jumper wire as the system was not sending power to the compressor clutch.



So far I found two problems... one was that the electronic temperature cycling switch was bad (still on order) and the other was the wide open throttle relay (replaced relay), so my question is what sends the signal for wide open throttle? I figure it was the TPS? But what about a MT truck... they don't have a TPS???



Third question... At this point manually running the compressor I'm only getting about 170psi on the high side (suction running around 35psi). This seems low to me as I was expecting to see 200-240psi. Would this be an indication that my compressor is worn???

 

[MMiller]

High pressure is dependant on a few things, overall charge of freon, and outside temp. Hot days high side will be higher. If it was cool outside, low humidity your high side will be lower.



What was your duct temp? Was it cold? How is the overall performance?



I don't so much worry about high side unless its really high, as long as the duct temp is cold enough, and the low side does not get under 10 psi. Try watching the gauges with some rpms, if it pulls down under 10 psi at higher rpms, I pump in a little more freon.



I looked up about the WOT relay, and can't remember how/why it was there. I wonder if it would not allow the a/c to kick in at WOT because the clutch would slip, say if the a/c was on a gasser engine turning 5000 rpms. I would not worry about it, you could always install a jumper wire in the relay slots to take it out of the equation.



Michael

 

[Greenleaf]

According to the manual there is not a WOT relay. If you have the early first gen there is only the starter relay. If you have the latter, you have the a/c clutch relay, starter relay and the auto shut-down (alternator) relay.

 

[HRDROKN]

According to the manual there is not a WOT relay. If you have the early first gen there is only the starter relay. If you have the latter, you have the a/c clutch relay, starter relay and the auto shut-down (alternator) relay.

Ya... that makes sense. It appears that my factory wiring schematic is a bit miss labeled as it is calling the A/C clutch relay a WOT relay ... . and I'm sure that I'm on the diesel schematic (rather than gas)



Once I get the clutch cycle temp switch in (should pick it up at the stealership tonight) I will check my duct temp... it felt good, but it was about 115 degrees out on the drive way that day :-laf

 

[Greenleaf]

and I'm sure that I'm on the diesel schematic (rather than gas)

It's apparent your on SOMETHING :-laf

Just kidding.



-S

 

[HRDROKN]

It's apparent your on SOMETHING :-laf

Just kidding.



-S

This is what happens when all the prescription meds run out... . :-laf