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Old 06-06-2022, 04:59 PM   #1
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2002 L-Series 3.0L Sedan
2003 L-Series 3.0L Wagon
Default 2002 L300 A/C problem

02 L300 with 212K miles.
A/C has always worked well until now.
A/C was not cooling. Clutch was not engaging.
Hooked up gauge set,proceeded to add refrigerant.Things seemed normal at first , but then then clutch would only engage for a second , then after a few seconds it would engage again over and over.
The low side reads really high, 100+ PSI, the high side is really low, less than 100 PSI.
What is the probably problem ? TXV ?
Thanks in advance for your help.
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Old 06-06-2022, 08:54 PM   #2
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Default Re: 2002 L300 A/C problem

Is this the first time for refilling/topping of refrigerant? Is sealer used? When connecting gauges, are gauge hoses purged of air?
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Old 06-06-2022, 10:28 PM   #3
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Default Re: 2002 L300 A/C problem

Quote:
Originally Posted by fdryer View Post
Is this the first time for refilling/topping of refrigerant? Is sealer used? When connecting gauges, are gauge hoses purged of air?
No, no, yes
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Old 06-07-2022, 06:44 AM   #4
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Default Re: 2002 L300 A/C problem

I topped it off a few years ago.
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Old 06-07-2022, 09:50 AM   #5
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Default Re: 2002 L300 A/C problem

With well over 200k miles and topping off, the compressor cycling frequently without any more info is a mystery to me. When gauges are connected with both manifold valves closed, do you see the low side pressure drop as soon as the compressor cycles on? How long does the compressor run before cycling off? How long does the compressor remain off before cycling on? Are there any signs of refrigerant oil and dye anywhere? A uv blacklight is needed to see dye at night, under a tree or dimly lit garage.
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Old 06-07-2022, 03:46 PM   #6
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Default Re: 2002 L300 A/C problem

Have you tested the clutch relay?

Manually activate the clutch and verify it remains engaged?

It sounds more like a failing clutch or relay or both.
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Old 06-08-2022, 09:46 AM   #7
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Default Re: 2002 L300 A/C problem

Apparently my manifold high pressure gauge has failed. Even though it never showed the high side to be over 100 PSI I had over filled the system.
Took the car to someone I know who has an A/C reclamation/ charging machine.
We extracted the refrigerant from the car, it was 2.78 lbs. Refilled with the proper amount, 2.09 lbs. System seems to be working properly now.
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Old 06-08-2022, 11:38 AM   #8
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Default Re: 2002 L300 A/C problem

I was a victim (from poor judgement) of a popular auto store set of ac gauges when R134a systems came out. The cheap quick connect fittings gave me trouble with minor repairs made until I decided my investment was taking more time in band aid repairs to this set. I bought a set of gauges from a well known brand similar to my original r12 set from 50 years ago. Never had trouble with the r12 set other than replacing the rubber bushings on hose ends. The r134a set is just as reliable and not that more in cost than the cheap set it replaced. My shortsightedness was thinking I wouldn't have to have many r134a repairs so a cheap set of gauges would do. I was wrong.
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