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Old 02-24-2018, 11:58 AM   #1
Aspenglade
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2001 SL1
Default 2001 SL1 - A/C R&R parts, flush, oil

I plan on replacing the a/c system, with the exception of the Evaporator and Tube (evap to dryer).

1. How do I flush the Evaporator core?
2. Is there a drawing or procedure to remove it, if not flushable?
3. What type of oil do I need. Is it PAG 100? Brand?
4. What is the total volume oil needed for the system?
5. What is the volume of oil needed for the individual parts: Condenser, Dryer, Compressor Evaporator?

I appreciate any comments.

Thanks,

R&R:

Suction Hose
Discharge Hose
Expansion Valve
Condenser
Dehydrator/Dryer
Compressor
Condenser

Flush:
Evaporator Core
Tube (evap to dyrer)

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Old 02-24-2018, 12:37 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: 2001 SL1 - A/C R&R parts, flush, oil

If I'm not mistaken, service manuals don't discuss any procedures for flushing ac systems so you're left to guess. Fortunately, there are aftermarket products and procedures for flushing systems of oil and contaminants. Google for info. The easiest way to flush the evaporator coil is with both hoses off, thermal expansion valve removed for access to the coils, and flushing solvent hose placed into one end of an opening. There's a guideline for using specific amounts of oil for each major part replaced to equal the total amount. Pouring oil into each part ensures oil is distributed so the compressor will have adequate lubrication when a system is restored. Oil circulates throughout a system - liquid refrigerant (when compressed) moves oil around. Pm me an email address that allows files and I'll send service manual info. It doesn't matter who makes pag oil as long as the correct weight is used. Older Saturns use pag 100 while the rest use 46. There are sites selling compressors that list which oil to use.

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Old 02-24-2018, 02:24 PM   #3
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1996 SC2
2006 VUE 3.5L
Default Re: 2001 SL1 - A/C R&R parts, flush, oil

I was surprised how easily the evap was to flush. It doesnít have the resistance the condenser does. I just used regular flush with a bottle connected to compressed air.
I canít remember the design of the evap off the top of my head to know if the flush flows through the entire core or just flushed the path of least resistance.

-Robert

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Old 02-24-2018, 05:41 PM   #4
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Default Re: 2001 SL1 - A/C R&R parts, flush, oil

All evaporator coils are serpentine (tube) construction where its one long tube folded over into bends. The parallel flow condenser coils for r134a systems are not like older r12 condenser coils with a serpentine tube design. Parallel flow condenser coils are smaller flat tubes allowing simultaneous flow from one side to the other as compared to flowing thru one tube, serpentine fashion. Flat tube design contaminates easier and doesn't lend itself to flushing methods. Most searches results in negative comments about flushing r134a condenser coils and another reason not to use any sealer. By designing flat tubes, less refrigerant is needed while gaining more surface area for heat transfer to airflow.

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Old 03-11-2018, 04:54 AM   #5
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Default Re: 2001 SL1 - A/C R&R parts, flush, oil

Quote:
Originally Posted by RobertGary1 View Post
I was surprised how easily the evap was to flush. It doesnít have the resistance the condenser does. I just used regular flush with a bottle connected to compressed air.
I canít remember the design of the evap off the top of my head to know if the flush flows through the entire core or just flushed the path of least resistance.

-Robert
I missed this comment. If I'm not mistaken, evaporator coils are similar to heater cores but designed for very high burst pressures and absolute vacuum. The free flow of refrigerant thru the evaporator coil is similar to coolant thru the heater core, unrestricted. The thermal expansion valve restricts and controls high pressure liquid r134a, metering it to the evap coils as vacuum from the compressor suction side pulls rapidly expanding gases thru, expansion of high pressure liquid into low pressure gas, absorbing heat thru the tube walls and fins. The restriction in the ac system is the txv, separating the high side from low side. When the txv is removed, the evap coils resembles a heater core without any restriction. Flushing the evaporator coil after txv removal is the same as flushing a heater core.

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