A/C question
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Junior User
Joined: Oct 2006
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From: Bourbon, Mo.
A/C question
ok, here goes. I read in the A/C forums that you can back flush an A/C system?
How is this done? My compressor was locked up on my 91 F-150,5.0 (it was like that when I bought it) So anyway, I got a good compressor from a working system & put it on & when I jumpered the pressure switch & put oil in it, it engaged for about a minute & then tried to lock up?! I pulled the wire from the jumper so it didn't burn the clutch,Then I relieved some of the pressure & jumpered it again & it ran for another minute & tried to lock up again. My buddy has a pump that I can use to pump the system down, but I'm wondering if I'm going to have to replace the evacuator/drier & possibly the condensor if it is clogged since the original compressor was siezed? Anyone know how this is done under a shade tree?
How is this done? My compressor was locked up on my 91 F-150,5.0 (it was like that when I bought it) So anyway, I got a good compressor from a working system & put it on & when I jumpered the pressure switch & put oil in it, it engaged for about a minute & then tried to lock up?! I pulled the wire from the jumper so it didn't burn the clutch,Then I relieved some of the pressure & jumpered it again & it ran for another minute & tried to lock up again. My buddy has a pump that I can use to pump the system down, but I'm wondering if I'm going to have to replace the evacuator/drier & possibly the condensor if it is clogged since the original compressor was siezed? Anyone know how this is done under a shade tree?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
How are you putting the oil in?
Sounds like you are locking it with the oil.
Oil like any liquid is a non-compressible and will lock or blow out the valves if you put it in the suction line to the compressor.
I would think the compressor would already have oil in it and maybe one can of refrigerant with oil in it would be enough while charging.
Sounds like you are locking it with the oil.
Oil like any liquid is a non-compressible and will lock or blow out the valves if you put it in the suction line to the compressor.
I would think the compressor would already have oil in it and maybe one can of refrigerant with oil in it would be enough while charging.
Thread Starter
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Junior User
Joined: Oct 2006
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From: Bourbon, Mo.
You made a valid point there? However, the sytem had been converted to 134A before & I just hooked the 4oz. can of 134A oil to the low side & let the pressure from the can put the oil in, it didn't take but maybe an oz. from it, maybe 2oz. Then I started the engine & jumpered the pressure switch & let it run for a min. then I hooked a can of 134A to it & thats when it started locking up? Like I said, I can relieve the pressure & it'll run for a min. then it'll lock up again. I guess I'll have to wait & get it pumped down & start over? I was just wondering how I can back flush it in case the system is clogged?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
From the Ford Shop Manual:
A/C System Flushing
WARNING:
USE EXTREME CARE AND OBSERVE ALL SAFETY AND SERVICE PRECAUTIONS RELATED TO THE USE OF REFRIGERANTS.
WARNING:
DUE TO REFRIGERANT HAZARDS. ALWAYS WEAR SAFETY GOGGLES AND NON-PENETRABLE GLOVES WHEN WORKING ON OR FLUSHING A/C SYSTEMS.
CAUTION:
A/C Refrigerant Analyzer must be used before the recovery of any vehicle's A/C refrigerant. Failure to do so puts the shop's bulk refrigerant at risk of contamination. If the vehicle's A/C refrigerant is contaminated, refer the customer to the service facility that performed the last A/C service. If the customer wishes to pay the additional cost, use the A/C recovery equipment that is designated for recovering contaminated A/C refrigerant. All contaminated A/C refrigerant must be disposed of as hazardous waste. For all equipment, follow the equipment manufacturer's procedures and instructions.
CAUTION:
Suction accumulator/drier, muffler, hoses, thermal expansion valve, and fixed orifice tube should be removed when flushing the A/C system. Internal plumbing of these devices makes it impossible to properly remove any residual-flushing agent. Except for the hoses, these components are typically discarded after A/C system contamination. Hoses can normally be reused unless they are clogged with debris. The 3.78 liters (1 gal) of Ford A/C Flushing Solvent F4AZ-19579-A and FL1-A filter used in A/C Flusher, 219-00002 are intended for use on one vehicle only. They may be used to flush both the A/C condenser core and the A/C evaporator core on an individual vehicle, but under no circumstances should they be used on more than one vehicle.
1. NOTE: Prior to using the A/C Flusher, 219-00002 for the first time, review the operating instructions.
NOTE: Only the A/C Flusher Kit,219-00002 which includes A/C Flusher, A/C Flusher Fitting Kit and the Ford Part number F4AZ-19579-A A/C system Flushing Solvent, is approved for use on Ford vehicles. No other flushing device or solvent is approved for flushing heat exchangers. Use of any other Flusher or solvent may cause damage to the A/C system and the flushing unit.
Ford Motor Company has approved a procedure to provide technicians with a non-CFC method of flushing contaminated A/C system heat exchangers, A/C evaporator core, A/C condenser core. The procedure allows the specific components to be cleaned and flushed while installed in their normal in-vehicle location. The types of contamination flushed include particle matter that results from A/C compressor and/or desiccant failure within the suction accumulator/drier and gummy residue that may form when refrigerant oil is overheated during A/C compressor seizure. The flushing process is a two step procedure that involves the use of an A/C Flusher, 219-00002 to:
Circulate the flushing solvent through the heat exchanger in the reverse direction of normal refrigerant flow (back-flushing). Particulate matter picked up during flushing is filtered from the returning solvent before the solvent is returned to the reservoir for continued circulation.
l Remove the flushing solvent from the heat exchanger. In this step of the procedure, pressurized air 621-862 kPa (90-125 psi) is used to push and/or evaporate any remaining flush solvent from the heat exchanger.
2. Discharge the A/C system. Observe all safety precautions. For additional information, refer to the procedure in this section.
3. Disconnect the refrigerant lines from the heat exchanger(s) to be flushed.
4. Connect the A/C Flusher, 219-00002 and A/C System Flusher Fitting Kit to the heat exchanger to be flushed. Do not flush through the A/C evaporator core orifice, mufflers or hoses. Internal plumbing and material make-up of these components make it impossible to properly remove debris and/or residual flushing solvent.
5. Use four liters (one gallon) of Ford A/C Flushing part number F4AZ-195790A to flush the heat exchanger for a minimum of 15 minutes. The flush solvent may be used for one or both heat exchangers in the A/C system. However, the flush solvent is intended for one vehicle only. The filter is used on the flushing unit is also intended for use on one vehicle only.
6. Flush the component for a minimum of 15 minutes.
7. Apply 621-862 kPa (90-125psi) pressurized air to the component for a minimum of 30 minutes. The 30-minute purger time is required to force and/or evaporate all residual solvent from the A/C system component. Failure to successfully remove all residual solvent within the component can result in system damage when reconnected and operated. Dispose of the used flush solvent and filter in accordance with local, state and federal emissions.
8. NOTE: A/C system filtering as described in this section is optional if system flushing is performed. However, the filter kit use is recommended after flushing if the A/C system contamination is extensive.
Replace the A/C evaporator core orifice in any vehicle being serviced for A/C compressor or desiccant failure.
9. Replace the refrigerant hoses if clogged with debris.
10. Reconnect the heat exchanger being serviced.
11. Add additional refrigerant oil as required. For additional information, refer to the procedure in this section.
12. Evacuate, leak test and charge the A/C system. For additional information, refer to the procedure in this section
13. Check the system for proper operation.
A/C System Flushing
WARNING:
USE EXTREME CARE AND OBSERVE ALL SAFETY AND SERVICE PRECAUTIONS RELATED TO THE USE OF REFRIGERANTS.
WARNING:
DUE TO REFRIGERANT HAZARDS. ALWAYS WEAR SAFETY GOGGLES AND NON-PENETRABLE GLOVES WHEN WORKING ON OR FLUSHING A/C SYSTEMS.
CAUTION:
A/C Refrigerant Analyzer must be used before the recovery of any vehicle's A/C refrigerant. Failure to do so puts the shop's bulk refrigerant at risk of contamination. If the vehicle's A/C refrigerant is contaminated, refer the customer to the service facility that performed the last A/C service. If the customer wishes to pay the additional cost, use the A/C recovery equipment that is designated for recovering contaminated A/C refrigerant. All contaminated A/C refrigerant must be disposed of as hazardous waste. For all equipment, follow the equipment manufacturer's procedures and instructions.
CAUTION:
Suction accumulator/drier, muffler, hoses, thermal expansion valve, and fixed orifice tube should be removed when flushing the A/C system. Internal plumbing of these devices makes it impossible to properly remove any residual-flushing agent. Except for the hoses, these components are typically discarded after A/C system contamination. Hoses can normally be reused unless they are clogged with debris. The 3.78 liters (1 gal) of Ford A/C Flushing Solvent F4AZ-19579-A and FL1-A filter used in A/C Flusher, 219-00002 are intended for use on one vehicle only. They may be used to flush both the A/C condenser core and the A/C evaporator core on an individual vehicle, but under no circumstances should they be used on more than one vehicle.
1. NOTE: Prior to using the A/C Flusher, 219-00002 for the first time, review the operating instructions.
NOTE: Only the A/C Flusher Kit,219-00002 which includes A/C Flusher, A/C Flusher Fitting Kit and the Ford Part number F4AZ-19579-A A/C system Flushing Solvent, is approved for use on Ford vehicles. No other flushing device or solvent is approved for flushing heat exchangers. Use of any other Flusher or solvent may cause damage to the A/C system and the flushing unit.
Ford Motor Company has approved a procedure to provide technicians with a non-CFC method of flushing contaminated A/C system heat exchangers, A/C evaporator core, A/C condenser core. The procedure allows the specific components to be cleaned and flushed while installed in their normal in-vehicle location. The types of contamination flushed include particle matter that results from A/C compressor and/or desiccant failure within the suction accumulator/drier and gummy residue that may form when refrigerant oil is overheated during A/C compressor seizure. The flushing process is a two step procedure that involves the use of an A/C Flusher, 219-00002 to:
Circulate the flushing solvent through the heat exchanger in the reverse direction of normal refrigerant flow (back-flushing). Particulate matter picked up during flushing is filtered from the returning solvent before the solvent is returned to the reservoir for continued circulation.
l Remove the flushing solvent from the heat exchanger. In this step of the procedure, pressurized air 621-862 kPa (90-125 psi) is used to push and/or evaporate any remaining flush solvent from the heat exchanger.
2. Discharge the A/C system. Observe all safety precautions. For additional information, refer to the procedure in this section.
3. Disconnect the refrigerant lines from the heat exchanger(s) to be flushed.
4. Connect the A/C Flusher, 219-00002 and A/C System Flusher Fitting Kit to the heat exchanger to be flushed. Do not flush through the A/C evaporator core orifice, mufflers or hoses. Internal plumbing and material make-up of these components make it impossible to properly remove debris and/or residual flushing solvent.
5. Use four liters (one gallon) of Ford A/C Flushing part number F4AZ-195790A to flush the heat exchanger for a minimum of 15 minutes. The flush solvent may be used for one or both heat exchangers in the A/C system. However, the flush solvent is intended for one vehicle only. The filter is used on the flushing unit is also intended for use on one vehicle only.
6. Flush the component for a minimum of 15 minutes.
7. Apply 621-862 kPa (90-125psi) pressurized air to the component for a minimum of 30 minutes. The 30-minute purger time is required to force and/or evaporate all residual solvent from the A/C system component. Failure to successfully remove all residual solvent within the component can result in system damage when reconnected and operated. Dispose of the used flush solvent and filter in accordance with local, state and federal emissions.
8. NOTE: A/C system filtering as described in this section is optional if system flushing is performed. However, the filter kit use is recommended after flushing if the A/C system contamination is extensive.
Replace the A/C evaporator core orifice in any vehicle being serviced for A/C compressor or desiccant failure.
9. Replace the refrigerant hoses if clogged with debris.
10. Reconnect the heat exchanger being serviced.
11. Add additional refrigerant oil as required. For additional information, refer to the procedure in this section.
12. Evacuate, leak test and charge the A/C system. For additional information, refer to the procedure in this section
13. Check the system for proper operation.
