Having some A/C issues

[kikkup]

Hi I just bought a 1999 Chevy Tahoe LT last wee and I'm experiencing some issues with my A/C and some other stuff, Is this the right place if not could someone help me find the right spot.... Anyway my a/c blows cold as ice from the rear air vent, but the front just does not feel cold, Does anyone have any idea what would cause that????

 

[SunlitComet]

I clogged or missing orifice tube for the front evaporator is very likely especially if the fan blows just fine and the temperature door is fully functional.

 

[kikkup]

The temperature in the back is cold it will cool the truck, and The hot works, just dont feel cold in front, Just a little cool when it should be cold...

 

[SunlitComet]

You will need a gauge set to help solve it with any accuracy. But do make sure your evaporator is clean as well.

 

[kikkup]

OK I'm confused, There is only one line set coming out of the compressor The y where it goes to the back is after the orifice tube, Is there another orifice tube at the back of the truck???

 

[SunlitComet]

No, after the y coming form the condenser there is one line going to rear with a thermal expansion valve mounted on the rear evaporator it self. Then the other line goes to wards the the evaporator mounted in the front hvac assembly. Right after the split you should see a fitting the orifice tube is in there as depicted as #21 in the picture link below. In a nut shell if the inlet is hot and the outlet cold your front evaporator should be working. If the temperature is the same on either side the the orifice tube is broken open or missing providing no metering port to achieve proper operation. If the inlet is hotter and the outlet ambient temperature of the compartment there is a likely possibility that it is clogged. Remember the output of compressor goes to condenser first then splits into two lines one for each evaporator.

 

[gpracer1]

You can also check that the recirculation door is being held shut on high fan. This recently bit me in the *** as the NEW door motor was bad and allowed the fan to suck the door half open when blowing hi......half recirc and half 115 degree air. This made the AC feel like crap..... ~55 degree vent temps, after fix, ~40 degrees.

 

[kikkup]

Sorry guy's I still haven't got around to checking my a/c, I do know that it is cooler on one side of the orifice tube than the other, going to try to shoot it with a gun to get the exact temperature's.... and put my guages on it to check the freon pressure's.... I appreciate the feedback and I will keep you posted as soon as I can get out there to look at it...