I pinched off one of the heater core lines with a set of vise grips then took the truck out for a spin. I got 42 degree air out of the vent. I removed the vise grips and the temp went about by about 8 degrees :evil: So, I guess that answers the question of why the pressures and everything seem right...

Next is to find out why you are reheating the evap air before to reaches the vents. Ok, so do you think the in/out temps seem right and the pressures seem right? I guess you think that heat is getting introduced back into the cool air somehow/somewhere? I didn't get a chance to last night, but I ca...

The liquid line to evaporator was 46 degrees and the evaporator to accumulator was 43 degrees. I took both measurements about an inch from where the lines go into the HVAC box.

Heater valves fail. Also check the evaporator for crud. A plugged up air side will give poor performance, and considerable cooling of the suction line. A 10 year old pickup truck may have an evaporator full of leaves / dog hair / mouse nests... At lunch I looked at the heater hoses into and and out...

I don't see why the pressure readings wouldn't be accurate. Good point about hot water getting into the heater core. I haven't noticed a hot water shut off valve but haven't looked closely for one either. Do all cars have hot water cut off valves for when the A/C is on? I know my '69 Cougar does but...

I posted my pressure readings but didn't get any replies. From the little I know, I don't think the readings are bad but it cools better at idle than when going down the road so that makes me think it could be slightly low still. I put somewhere between 40-42oz of refrigerant in it. I read online th...

I got some low/high side readings. Here were the test conditions: outside air temp 77*, I parked the truck in the sun, opened the doors, set fan on high, set ac on max, had driven truck with a/c on prior to testing, held the engine at about 1500rpm and got 27 on the low side and 190 on the high side...

I don't have pressure readings at 1500rpm yet but can get those tonight or this weekend and report back. I do know it was right around 30 at idle.

I knew the fan was supposed to be on high and set on max but didn't know windows were supposed to be down or doors open. The sticker calls for 40oz. I put 3 12oz cans in and between 1/3 to a 1/2 of a 4th can. I did have a similar test scenario last night- fan on high, set on max a/c, held throttle a...

I installed a new orifice tube last night, vacuumed the system and then charged.  It was about 74 degrees outside.   When I went out for a test drive the best temp I would get out of the vent was about 45 degrees and it went up to 51 when I'm guessing the compressor was off.  With outside air temp o...