Dodge A/C Help

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a1parrothead
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Dodge A/C Help

Postby a1parrothead » Wed Aug 12, 2020 10:58 pm

Hello all,
I am working on a 96 Dodge Ram van 3500 with a 318. It sounds like the compressor is clicking on and off all the time.
I had the R134 checked twice and it is full and pressures are fine.
I replaced the high and low pressure switches in the lines.
It still is clicking. It blows nice cold air, but cycles a lot.
My local shop has tapped out!
Any ideas? Maybe another pressure switch somewhere? Bad compressor?
Jeff
Al9
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Re: Dodge A/C Help

Postby Al9 » Thu Aug 13, 2020 3:26 am

a1parrothead wrote:Hello all,
I had the R134 checked twice and it is full and pressures are fine.

Before dismissing it with "It's normal since it's a cycling clutch orifice tube system", which sounds like what a shop would say when giving the runaround, are you sure that the actual refrigerant charge weight has been checked and it's within specs for that car? Or is the shop only looking at pressures and using them to diagnose whether the system is fully charged or not? Cooling but cycling a lot in hot weather with a CCOT system sounds like the refrigerant charge is slightly low.
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Cusser
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Re: Dodge A/C Help

Postby Cusser » Thu Aug 13, 2020 5:59 am

Would not hurt to check the AC clutch gap.

Had the gap issue on my '98 Frontier last summer, removed one shim to fix.
a1parrothead
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Re: Dodge A/C Help

Postby a1parrothead » Thu Aug 13, 2020 6:20 am

It has only been checked by gauges. How do the check refrigerant weight? Would they evacuate the system then put in specified weight?

I will research the the gap. I do not know anything about it.

Thanks for the replies,
Jeff
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Tim
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Re: Dodge A/C Help

Postby Tim » Thu Aug 13, 2020 6:37 am

Cusser is on track with suggesting the clutch gap might be too wide. If the proper charge level is confirmed. This would be my first area of concern.

You also need to have someone reclaim the refrigerant, evacuate the system, and recharge by weight. Then see what the readings are.
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Al9
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Re: Dodge A/C Help

Postby Al9 » Thu Aug 13, 2020 6:51 am

a1parrothead wrote:It has only been checked by gauges. How do the check refrigerant weight? Would they evacuate the system then put in specified weight?

Then they didn't check the refrigerant charge weight AT ALL.
Refrigerant charge weight is checked by recovering whatever's left in a system and weighing it.

My advice: go somewhere else where they have a RRR station (google for "refrigerant recycle recharge station" to see how one looks).

To me, a shop who tells you the system is full based on pressure readings alone doesn't sound like a serious shop.

Proper AC maintenance is expensive.
a1parrothead
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Re: Dodge A/C Help

Postby a1parrothead » Thu Aug 13, 2020 7:28 am

OK. I will look at all of that.

Also thinking maybe failing expansion valve?

Also read about a clogged screen somewhere in the system? But cannot find it on the internet again.
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JohnHere
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Re: Dodge A/C Help

Postby JohnHere » Thu Aug 13, 2020 7:42 am

Pressure readings surely will help us with a diagnosis. Do you have a manifold gauge set that you can hook up?
a1parrothead
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Re: Dodge A/C Help

Postby a1parrothead » Thu Aug 13, 2020 7:59 am

My neighbor has one. I will borrow it in the next day or so.
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JohnHere
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Re: Dodge A/C Help

Postby JohnHere » Thu Aug 13, 2020 8:43 am

When you're testing the pressures, have the engine at about 1,800 RPM, windows and doors open, blower on medium speed, and A/C on normal. This is to get the compressor pumping sufficiently and to maximize the heat load on the system. Be sure to record the pressures while the compressor is running and not after it clicks off. Also record the ambient temperature just in front of the grille, not what the weather report says.

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