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Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Pontiac
Satisfied Customers: 2992
Experience:  Owner at Carolina Auto Service & Sales , 20 years Experience in Foreign & Domestic vehicles
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I have a 1998 pontiac bonniville that the ac compressor

Customer Question

i have a 1998 pontiac bonniville that the ac compressor keeps going bad i have flushed the system twice when i replace the compressor it will work for a couple days then it will blow cold the compressor will still be running but hot air coming out
Submitted: 11 months ago.
Category: Pontiac
Expert:  Chad Farhat replied 11 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question now, and I will post back with your reply ASAP

Expert:  Chad Farhat replied 11 months ago.

You said you flushed , did you flush the condenser , evaporator and was the a/c drier replaced ?

please let me know

Thank You ***** ( aka -Customer)

ASE Certified Tech

Customer: replied 11 months ago.
also replaced the orfice tube
Expert:  Chad Farhat replied 11 months ago.

after the failure when you pulled orifice tube , was there a lot of metal shavings in it ?

Customer: replied 11 months ago.
no
Customer: replied 11 months ago.
the temp in the lines is within a couple degress of each other the clutch is engaged but the air is not cold i recopvered 134 and pulled vacuum last night it held over night recharged and got the same results so i know the charge is rite but with the temp being the same on both suction and discharge pretty much the compressor has to be junk i would think but if i put a new one on it will be bad in a couple days
Expert:  Chad Farhat replied 11 months ago.

if you hook up a high side gauge while a/c running when it was working how high the pressure goes on the high side , do you know ?

and then look at compressor running at low side you should see 30 to 50 psi running, if the compressor is on 60 70 and up or if its 20 to 10 or going in the minus psi than yes the compressor is junk

Expert:  Chad Farhat replied 11 months ago.

was it new , where did you buy from ?

Expert:  Chad Farhat replied 11 months ago.

i had cases where no matter what you do on the condenser you cant clean it, so looking at high side pressure on the gauge is imperative here are we building pressure while a/c is running , if all parts has been cleaned and still have high pressure , REPLACE THE CONDENSER , those small metal shaving hard to get out of condenser sometimes

Expert:  Chad Farhat replied 11 months ago.

A good a/c system running you should see

LOW side 30 to 50 psi is great depends on temp outside

HIGH SIDE not higher that 175 150 , also depends on temp outside, if the high goes into 200 plus than u have a restriction

Hope I was helpfull to you ,Let me know if you need anything else on it

A Positive rating is Much Aprecciated

This Post Will Stay Open for you to Come Back And Ask Me Any Follow Up Questions You May have On This Issue Even after You Rate Me

Thank You

Chad Farhat ( aka -Customer)
ASE Certified Technician

Expert:  Chad Farhat replied 11 months ago.

Just let me know if you need anything else on it :)

Thank You ***** ( aka -Customer)

ASE Certified Tech

Customer: replied 11 months ago.
my low side is 110 and the high side is 150
Expert:  Chad Farhat replied 11 months ago.

Compressor NO GOOD , IT has NO suction at 110

Expert:  Chad Farhat replied 11 months ago.

now you want know if the high side restricted , probably not from what u told me you changed , but check it , until you install another one , when you do and seen it go down to 50 , then watch the high side if it passes the 150 and climbs , if it does, then you need to look for the restriction , if it stayed at 150 or around and you started cooling , then you goood

Expert:  Chad Farhat replied 11 months ago.

Hope I was helpfull to you ,Let me know if you need anything else on it

A Positive rating is Much Aprecciated

This Post Will Stay Open for you to Come Back And Ask Me Any Follow Up Questions You May have On This Issue Even after You Rate Me

Thank You

Chad Farhat ( aka -Customer)
ASE Certified Technician

Customer: replied 10 months ago.
this thing is crazy i have to be missing something i have replaced the condensor the evaporator the compressor trhe accumulator the orfice tube yet ever time the high side pressure is over 225 it blows cold but it is going to take the compressor out again makes no sernse
Expert:  Chad Farhat replied 10 months ago.

when you rev it up to 2500 rpm and a/c running ,where is your low side gauge at ?

Expert:  Chad Farhat replied 10 months ago.

your 225 on the high side , is a restriction indicator ?

how high is the high pressure goes , if you keep it running with a/c on ,does keep climbing

Chad

Customer: replied 10 months ago.
it seems to peak at 250 but i havent ran it long because i am afraid to damage the compressor i have changed the whole system preaty much the radiator is clean fans turning good even if i put a additional fan in front of car pressure doesnt change
Expert:  Chad Farhat replied 10 months ago.

YOU HAVE A RESTRICTION .

ARE THE FANS RUNNING WHEN HIGH GOES UP ?

Expert:  Chad Farhat replied 10 months ago.
TO HIGH .

150 TO 175 WHAT YOU NEED TO SEE ,

Is all the parts new that were installed new

please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 10 months ago.
i agree all parts are new and both fans run all the time that the ac is on
Customer: replied 10 months ago.
as far as i can tell the only piece i havent change is the line that the orfice tube goes in but i took it off and it seems to be clean
Expert:  Chad Farhat replied 10 months ago.

What is my low side ,with car running and a/c running ?

Customer: replied 10 months ago.
around 30
Expert:  Chad Farhat replied 10 months ago.

and with engine reved up to 2500 rpm , what is it then /

Expert:  Chad Farhat replied 10 months ago.

when u rev it up does that needle start to go down passed 30 ?

Customer: replied 10 months ago.
just for a second then rite back to where it was
Expert:  Chad Farhat replied 10 months ago.

did you flush your lines before install ?

we know condenser , a/c drier all new , how about the flusing

did u put on a/c machine and did a recovery,evacuate and vacuum before recharge

Expert:  Chad Farhat replied 10 months ago.

how far down passed 30 it goes for a second ?

Customer: replied 10 months ago.
just a couple psi and yes i have flushed the system several times and recovers and pulled vacuum
Expert:  Chad Farhat replied 10 months ago.

ok i can see why frustrated i would be too

but there is something we are missing here ?

Expert:  Chad Farhat replied 10 months ago.

you mentioned when you replace compressor it works for a couple of days ,

Customer: replied 10 months ago.
its works for 2 to 3 days
Customer: replied 10 months ago.
i agree i just dont understand what i am missing
Expert:  Chad Farhat replied 10 months ago.

in this case , you need to do this

1- flush again

2- replace compressor

there is nothing left , there is either trash still in system, but you said orifice is clean ,that leaves a defective compressor

remember , the key is IT WORKED FOR FEW DAYS ? So we know at least the a/c compressor is correcting the problem for few days , now the failure later has to be one of 2 things that I mentioned above

Hope I was helpful to you , Please let me know if you need anything else on it

A Positive Rating is Much Appreciated

This Post Will Stay Open For You to Come Back and ask me any Follow up Questions you may have on this issue Even after you Rate Me.

Thank You
Chad Farhat ( aka -Customer)
ASE Certified Technician