A/C causing truck to studder
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A/C causing truck to studder
so i have cleaned and replaced the IAC valve.
The A/C works but not anywhere near as cold as it should/could be. I did have to use one of those cans to recharge it 2 years ago and im wondering if i have the incorrect pressures or too much/too little/not under a vacuum much anymore.
What happens is when the AC kicks on i can feel it even at interstate speeds, when it kicks on and off around town it makes the whole truck kinda shudder. Makes shifting kinda pain. It also feels like it really sucks what little power the 3.0 can make and especially noticeable on acceleration.
Is this normal? (never owned a manual vehicle with working AC).
The A/C works but not anywhere near as cold as it should/could be. I did have to use one of those cans to recharge it 2 years ago and im wondering if i have the incorrect pressures or too much/too little/not under a vacuum much anymore.
What happens is when the AC kicks on i can feel it even at interstate speeds, when it kicks on and off around town it makes the whole truck kinda shudder. Makes shifting kinda pain. It also feels like it really sucks what little power the 3.0 can make and especially noticeable on acceleration.
Is this normal? (never owned a manual vehicle with working AC).
No, doesn't sound right
AC Compressor shouldn't "kick" on and off that much if AC is ON, it can do that when AC is off and in defrost mode
May need to drain and flush system and replace orifice tube and dryer(always) then refill
AC systems have two pressure switches on the hoses/lines
High pressure switch will shut off the compressor if there is a blockage, so lines don't "explode"
Low pressure switch prevents compressor from "running dry", compressor needs the oil in the "freon" to stay lubricated or it will burn out, so low pressure switch will turn off the compressor if pressure going to the compressor drops too low
AC systems are pretty simple, in cars, refrigerators or houses
The compressor does what it says, it compresses "freon" which raises its pressure an HEATS it up, this hot "freon" then goes to the Condensor, in front of radiator to cool it a bit, this allow any "freon" that was too hot and turned into a Gas to "condense" back to a liquid.
This hot liquid then goes to the dryer/storage tank
Then it goes thru the orifice tube or expansion valve where it is allow to de-pressurize, this is what COOLS the evaporator(in heater box)
After going thru evaporator the now lower pressure "freon" goes back to compressor, to repeat the journey
If you have a blockage the high pressure switch may be turning off compressor until pressure drops, or low pressure switch may be turning off compressor because not enough "freon" is coming thru and turns it back on when there is enough
Hooking up pressure gauges can tell you whats happening
AC Compressor shouldn't "kick" on and off that much if AC is ON, it can do that when AC is off and in defrost mode
May need to drain and flush system and replace orifice tube and dryer(always) then refill
AC systems have two pressure switches on the hoses/lines
High pressure switch will shut off the compressor if there is a blockage, so lines don't "explode"
Low pressure switch prevents compressor from "running dry", compressor needs the oil in the "freon" to stay lubricated or it will burn out, so low pressure switch will turn off the compressor if pressure going to the compressor drops too low
AC systems are pretty simple, in cars, refrigerators or houses
The compressor does what it says, it compresses "freon" which raises its pressure an HEATS it up, this hot "freon" then goes to the Condensor, in front of radiator to cool it a bit, this allow any "freon" that was too hot and turned into a Gas to "condense" back to a liquid.
This hot liquid then goes to the dryer/storage tank
Then it goes thru the orifice tube or expansion valve where it is allow to de-pressurize, this is what COOLS the evaporator(in heater box)
After going thru evaporator the now lower pressure "freon" goes back to compressor, to repeat the journey
If you have a blockage the high pressure switch may be turning off compressor until pressure drops, or low pressure switch may be turning off compressor because not enough "freon" is coming thru and turns it back on when there is enough
Hooking up pressure gauges can tell you whats happening
Last edited by RonD; Jul 18, 2019 at 11:53 AM.
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