Engine Size: 1.8
Refrigerant Type: 134a
Ambient Temp: 110
Pressure Low: 45
Pressure High: 290
Country of Origin: United States
Alrite here goes having trouble with my system worked good last summer this summer different story only seeing temps at the center vent of 60 when last summer had it down to 42 . When driving it heats up to almost 80 at the vent in stop and go and while on the freeway the coolest it will get is 60 and trys to get cooler but cuts on and off constantly . At idle outside temp about 110 high side is about 290 and low side is 45 now what gets me that my low side is low and doesn't match my diagram. my high side looks about right but the low side seems like it cant keep up with the high side . So today cleaned out the system replaced dryer did about a 2 hour vacuum let it sit for about 1 hour after that then charged the system about 24 ounces R134a and still no difference now one thing i have noticed is that my low side line is condensation alot but im in nevada there is no humidity here ? also i have my low side line wrapped with some thermo tec heat wrap to keep it from getting hot.
Maybe weak compressor ??? Expansion Valve ??? Need All opinions this is driving me nuts. Like i said i can feel the clutch kicking on and off while driving on freeway every 2-3 seconds . It is charged exactly how it was last summer and last summer even took it to the stealership to make sure i had everything right and all was good . im sure its a component failure just not sure. leaning towards the compressor seems as if it cant work hard like its supposed to if you know what i mean ...
fans are working which have been replaced last summer new compressor, condenser , new lines,dryer, evaporator assy containing , expansion valve and evap.. ac thermostat, and low/high pressure switch, radiator is new as well. so the air flow is not insufficient here . when driving
Edited: Mon July 20, 2009 at 5:49 AM by mxr695
your last paragraph states you replaced the evap with an orfice tube and expansion valve...you can't have both unless you have a rear evap.
my apologies its just a tube that goes from the engine bay (high side) to the expansion valve and then the expansion valve connects to the evap
the link below shows the diagram
Edited: Mon July 20, 2009 at 5:55 AM by mxr695
Check for reheating. If there's a mechanical water valve on the firewall, make sure it closes fully. Or pinch off the heater hoses and test drive. Compressor cycling on the highway suggests that the evaporator is getting down to 40F design temperature.
I believe you are correct so i go out to the garage jack up the hood and what do you know my hard line from the fuel is keeping the mechanical valve from closing all the way going to bypass this all the way to see if its back to normal. so i moved the line pulled the valve closed drove and wow way better got down to about 48 but the other side of the valve is still hot not really hot but hot . my low side line is sweating so much i have never seen it sweat like this and like i said there is no humidity here ??.
Alrite noticed today that my system was sweating alot drove it and it got warm temps were good until then around 42 then shot up to 65, the air got muggy then cooled back down evaporator froze im guessing pressure at idle were 36 low 225 high outside temp around 98 . im thinking expansion valve or dryer ????? any help pls thanks
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