A/c Problem

[stcspiderman]

I have a 1999 chevy silverrado, When I turn the ac on. all it does is blow hot air.

I checked the r134a that good at 35 40 psi low side. Ac compressor works checked all the fuzes there all good.

 

Anyone have any idea what could be wrong? all it does is blow hot air

 

http://www.gm-trucks.com/forums/index.php?showtopic=116431

[LeoS41280]

Without the hi side press, the low side press doesn't mean anything.

[stcspiderman]

checked the hi side that at 235psi

[ken1mod]

Just a note, while hi side pressure can be informative, low side is where refrigeration happens. Lo side pressure gives much more info than hi side.

 

ken

[stcspiderman]

hi side 250 low side is at 37. Is the by a chace that the blend door acturator is bad?

how many is there.

[txab]

I have a 1999 chevy silverrado, When I turn the ac on. all it does is blow hot air.

I checked the r134a that good at 35 40 psi low side. Ac compressor works checked all the fuzes there all good.

 

Anyone have any idea what could be wrong? all it does is blow hot air

 

http://www.gm-trucks.com/forums/index.php?showtopic=116431

Just bump your original thread next time. Starting a new thread doesn't help at all.

 

If your accumulator is is cold, then your not getting the air diverted to the right place

[stcspiderman]

Well I don't know, What was wrong, I pulled that plastic cover off on passager side there is a Actuator almost of the floor on passager side. I unpluged it pluged back in ac started working.

[jblakeney]

Sounds like the bleed door has the evaporator shut off and the heater core wide open.

 

Go out first thing in the morning feel the heater hoses at the heater core get in from the passengers side crank the truck. Turn the AC on. Feel the air coming out should be cool. Feel the accumulator it should be cool.looking at the pressures you said the AC should be working fine and as the heater hoses warm up your vent temp should rise with the hose temp.

 

The accumulator should sweat. This is normal. In between the high and low fittings you should feel the change in temp. The side towards the front will get hot and after the tube nut it will be cold

 

 

If this is what you find, its either blend door learn or time for a new blend door motor.

 

Let us know how it works out.

 

Jbo

[[email protected]]

I hate to say it, but in your other thread, I told you to check the blend door.

[stcspiderman]

Blend door witch is right above glove box? If I checked that opens and closes