Engine/Transmission (1998.5 - 2002) a/c ? pressure to high

[roller1000]

my a/c is taking a little longer to get cold this summer. I got a can of coolent to charge it up . I hooked up the can and before i added anything the pressure was already in the red. Is there a problem with my pump. I do get cold air but it takes a little longer then I think it should. Also when you stop at a red light it will get a little warmer comming out of the vents. what do you think? Thanks

 

[Bill Stockard]

If the low side pressure is too low and the high side is too high, there is a restriction in the system, i. e. debris in the condenser or in the fixed orifice tube.



Bill

 

[roller1000]

I could not check the high side but the low side is psi high. i am going by the gage that came with the recharge tank. it says its in the red (to high) the pump is kicking in and out fine. thanks

 

[Bill Stockard]

I could not check the high side but the low side is psi high. i am going by the gage that came with the recharge tank. it says its in the red (to high) the pump is kicking in and out fine. thanks

It's not possible to correctly trouble shoot the A/C system without a set of gauges in order to read both the high and low side pressure. High low side readings could possibly indicate a faulty compressor, drive belt/clutch slipping, or no fixed orifice tube in the system; however, without knowing what the high side is doing, it's like flying with blind-folders.



Bill

 

[roller1000]

thanks for the input! I will have to look a little deeper and get all the facts. thanks

 

[jtwcummins]

Check your cooling fan clutch. If the a/c works well at hiway speed and not at slower speeds the fan might not be pulling enough air through that stack of stuff, rad, intercooler & condenser coil, in front of the engine. I agree, the only way to properly troubleshoot a/c is with a gauge set. If the a/c can't get rid of the heat being removed from the cab pressures will be high. The only way to get an accurate picture is to use gauge