A/C Blowing warm. System no leak and blend door good

[Jb14]

Having an A/C issue in my 2005 Expi. Just replaced the compressor and condenser after A/C went out. Was Ice cold for 18 hours then gradually got warmer and warmer to now it blows just room temp. took back to mechanic, no leaks, in fact he recovered the freon something like 3.6 pounds (I have rear A/C) the front blend door was checked and will go to hot then back down to, well now room temp, so he is thinking there might be a blockage somewhere. Anyone have this issue before?

 

[stamp11127]

If the mechanic has the recovery system then he should know what the problem is.
New parts or used?
Why were those parts changed?
Anytime a compressor is changed it is recommended to also change the drier or accumulator.
What are the high and low side pressures when the compressor is running?

 

[Jb14]

I do not know what the high and low side readings were. He did state that it took longer to recover than normal and the the guages would show normal then max out back and forth like that. The compressor was engaging normally from what he stated.

 

[stamp11127]

Are you going to answer the remaining questions? If so, that would give us an idea of the condition of the system prior to "repair".

 

[Skauber]

Did you replace the accumulator/drier/filter assembly at the same time? It is always recommended to replace these when replacing major components of the AC. It is rare, but a filter can clog up to a point where it doesn't allow the freon to flow through the system.

 

[Jb14]

Thanks for you help guys!!

To summarize as best possible. A couple years back I had A/C issue that was mis-diagnosed, mechanic stated it was bad compressor (it was not the compressor, after a year of frustration found it was a pinhole leak in a connector). I replace OEM unit with an aftermarket kit that included dryer, filter etc. 6 Months ago the aftermarket compressor went out and I replaced with new but different aftermarket compressor, (to my knowledge they only replaced the compressor this time) A week ago A/C started blowing hot and found that I had a bad condenser (had hole) Mechanic replace condenser and to be on safe side warrantied out the compressor with a new one. And I forget the $40.00 part they replaced in the rear A/C line but to be sure it was not blocked I had them change it out (accumulator??)

 

[stamp11127]

OK, now we have more info to go on.
There are two schools of thought on r134a AC systems when something fails and fills the system with trash/particles.
Most techs will attempt to clean the system, "repair" what failed and send you on down the road. With the current refrigerant (r134a), the evaporator and condenser utilize smaller openings that trap more trash than the older r12 systems did. As time goes on the trash will free up from where it was logged and start plugging things up or holding valves open. System cleaning does work well as long as the compressor hasn't grenaded and sent shrapnel down the line.
Other techs will explain what has happened and recommend complete system replacement - most owners then have a coronary and say the vehicle isn't worth the investment and go with cheaper attempts.
So, if your compressor sent trash down the line........

 

[Jb14]

Thank you. I took it back to the shop, they are going to clean out the system and put in new, dryer, filer etc.

I will see what the deal is (hopefully) by end of today

 

[Jb14]

Here is the update, after a week of my truck being in the shop I will be picking up my truck today. Apparently when I had the first AC issue a couple years back and the mechanic mis diagnosis the issue, and was told I needed to replace the compressor, dryer etc (replace with a kit), The mechanic only replaced the condenser. So of course stuff started building up. to where I had allot of metal shavings and gunk built up. My A/C system was reading at 600 psi.

Parts replaced:
Compressor
Condenser
front and rear evaporators
Check valves
Dryer
Radiator (242k on truck so I figured it was time to replace while doing the job, (thermostat was replaced as maintenance 6 months ago) Interesting note my truck has the trailer package but the factory installed a radiator for non tow package truck, so now is correct.

All other incidentals where replaced as well, plus it took a gallon of the flush solution to clean my system.

After this I will assume I will be good to go.

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[stamp11127]

Maybe, maybe not. The soft lines have an internal liner that will allow the small metal shavings to impale themselves into. Over time they can free themselves and flow through the system clogging stuff up again. Should this start happening you will notice a change in pressures and get to to this all over again.

 

[Jb14]

Interesting you say that, the mechanic said everything has been replaced but the lines. I get what you are saying though.

Thank you

 

[Jb14]

Update on results the A/C works like new. Only issue is that when they replaced the rear evaporator the top notch technician forgot to put the fasteners on the two hoses that the radiator fluid goes through. So after a 600 mile drive my son noticed the carpet wet. Yes radiator fluid all through the carpet in fact the fluid ran the all the way up to the front passenger side where the wiring runs. I have torn the interior apart and cleaned up all I can to this point so hopefully deterred any electrical issues. I will be taking out all of the seats and carpet this weekend and pressure wash carpet. I have already purchased new thermal and sound carpet padding.

Cautionary tale if you have to get the back A/C worked on. Just unfortunate!! Sorry guys just had to vent!!!!