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Vehicle make/model = olds Aurora
Year = 2001
Mileage = 75500
Engine size = 4.0
dash lights = no
codes = no
work done prior = Ac recharged low pressure side is cold to the
touch.but only blows warm air in passenger compartment gauge cycles up in to the
alert area then returns to top of charged area.
tech = JK
question = What needs to be checked next? Car has been setting for
about 5 months. previous owner said is has been checked and their are no
leaks. You can hear pump cycle when fuse is pulled and replaced.
JK:
Is the compressor kicking off, and that is why the
> pressure goes back to normal?
> What is the high side pressure?
> I will try to be of some help.
VISITOR:
With the motor off or AC off motor running the low side pressure is 65#s.
When the ac is turned on it went down to 25#s after a few minutes it rose to about
27 #s and fluctuated between 27 and 33#s. Could hear a difference in the pump
each time fluctuation happened. I don't have a gage or larger fitting to measure
the high side pressure. The compressor makes kind of a knocking noise when it
was first turned on the last time I tried it. Any help will be appreciated. Just bought
the car and was told it had been sitting for 5 months checked and had no leaks
just needed to be charged.
Dennis
JK:
With a/c and engine off, 65psi sounds a little low. You are hearing the compressor
kick off when pressure gets below 25psi or so. the low side system pressure
should stay around 32-40 psi depending on underhood temps. The compressor
will kick off if too low-25 psi. Sounds like the freon charge is too low, therefore a
leak. could try to add 1/2 lb. more. Best way is to have the system evacuated, and
the proper charge put in. Should be about 2 lbs.
The knocking noise you are hearing could be a failing compressor. Need to have
the proper freon charge in the system before any other diag.
Back
Year = 2001
Mileage = 75500
Engine size = 4.0
dash lights = no
codes = no
work done prior = Ac recharged low pressure side is cold to the
touch.but only blows warm air in passenger compartment gauge cycles up in to the
alert area then returns to top of charged area.
tech = JK
question = What needs to be checked next? Car has been setting for
about 5 months. previous owner said is has been checked and their are no
leaks. You can hear pump cycle when fuse is pulled and replaced.
JK:
Is the compressor kicking off, and that is why the
> pressure goes back to normal?
> What is the high side pressure?
> I will try to be of some help.
VISITOR:
With the motor off or AC off motor running the low side pressure is 65#s.
When the ac is turned on it went down to 25#s after a few minutes it rose to about
27 #s and fluctuated between 27 and 33#s. Could hear a difference in the pump
each time fluctuation happened. I don't have a gage or larger fitting to measure
the high side pressure. The compressor makes kind of a knocking noise when it
was first turned on the last time I tried it. Any help will be appreciated. Just bought
the car and was told it had been sitting for 5 months checked and had no leaks
just needed to be charged.
Dennis
JK:
With a/c and engine off, 65psi sounds a little low. You are hearing the compressor
kick off when pressure gets below 25psi or so. the low side system pressure
should stay around 32-40 psi depending on underhood temps. The compressor
will kick off if too low-25 psi. Sounds like the freon charge is too low, therefore a
leak. could try to add 1/2 lb. more. Best way is to have the system evacuated, and
the proper charge put in. Should be about 2 lbs.
The knocking noise you are hearing could be a failing compressor. Need to have
the proper freon charge in the system before any other diag.
Back