AC problem

[jonjones80]

My AC is not blowing cold air at all. It is blowing air. I checked the compresser and the presure for the system and all is fine. So I went a bought some R134a and tried to recharge the system and still nothing. Is there anything else it could be? Is it possible to have a bad condensor?

 

[Robb]

grrr....911 forum...........grrrrrrrrrr

 

[jonjones80]

Sorry I didn't know where to put this. Does anybody have some suggestions?

 

[TPLYNCH]

What happens in MAX A/C? No cold at all?

 

[Glacier991]

checked the pressure how? Operating? high or low side? Does the compressor kick on when you select AC? Those little "tire pressure" type gauges you get with kits are all but worthless IMHO.

 

[msmith65]

Criteria for Explorer 911

grrr....911 forum...........grrrrrrrrrr

Explorer 911! description: "This forum is for situations where your truck is currently out of commission and the owner is in a crisis situation."

How does a broken AC in winter qualify for Explorer 911?

 

[Eneurb]

Is the compressor coming on at all??

 

[TPLYNCH]

Explorer 911! description: "This forum is for situations where your truck is currently out of commission and the owner is in a crisis situation."

How does a broken AC in winter qualify for Explorer 911?

Robb moved this thread from the 911 forum to here, a more appropriate forum. He is not stating that it should be 911.......

 

[davidmmm69]

well if it is warm or hottt and the ac is out. that to me is a 911 situation...

 

[Glacier991]

well days go by and no answers to my questions, so I'm not gonna be much help. I am out of town for a while, so if there is more info provided by the poster we can deal with it later I guess.... or someone else can answer him.

 

[msmith65]

Robb moved this thread from the 911 forum to here, a more appropriate forum. He is not stating that it should be 911.......

OK. That's just not how it looks.

 

[jonjones80]

My compressor is turns on when I turn the AC on. And I checked both high side and low side by sticking a pin in the hole to see if the was pressure and then I put a gauge to it. But it was one of those gauges on the 134 bottle to recharge the system.
And Glacier911 I am not tring to be rude but days go by? Its been one day I am sorry that I have a life off of the internet. You help is very much appreciated but you don't have to be a jerk cause it takes me a day to reply.

 

[msmith65]

If you're getting the right pressure readings high and low, you should get the right drop in temperature at the center outlet with the fan on HI. After 10 minutes' run-in with the windows closed, I would expect a reading there about 40 degrees.

If you don't get that and your pressures are correct, perhaps your heater controls are not turning completely off when you run the AC.

 

[Glacier991]

Well with the compressor running.... it truly is helpful (and I know not exactly easy to produce without a gauge set - which is a GREAT tool) to have high and low side readings... at the risk of sounding like that is some "holy grail" it is the fastest and best way to diagnose many things quickly in AC.

One question I have is whether you are getting "cold" at the evaporator.... in the passenger side near the firewall there is a round cylinder with pipes running into and out of it... see if either one feels cold... (one of those goes to the evaporator). If so, we need to see if maybe your heater controls are mixing cold and warm air....

If not... then the list grows. Condensors are passive devices, and as such rarely "go bad". (They can get so contaminated in a system failure as to need replacing but that is only to prevent them from "seeding a new failure) If you have metal slivers or other bad things floating around in your system (usually a system in compressor failure) the expansion valve can get filled up/plugged with "crud" and no cooling results... Also a failed compressor (as in a reed valve) can make the compressor unable to move refrigerant, hence no cooling. Both of those can be diagnosed from pressure readings. (Starting to see why those can be so helpful?)

Now, you have enough pressure in the system to run the compressor (25 psi or so). Refrigerant though a gas does not behave like air.... static pressure in a non-operational closed system with a charge of at least 50% will read the same as a full charge will (in psi) - more or less pressure equals temperature in degrees F. So measuring the pressure in AC really needs to be done with it operational, which yours is. Does your compressor kick in and out quickly? A system in good shape with a short charge will do that... when the compressor kicks in, the low side is quickly drawn down below 25 psi, and the compressor cuts out.... the system pressure (high/low) equalize and soon there is 25 psi and it kicks in, only to repeat and repeat the cycle. If yours is not doing that, something more sinister is at work. If it is it just needs refrigerant.

So I guess next questions are... do you feel a cold pipe into the evaporator? and...Is it cycling?