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my ac findings for those who care to enjoy

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Old 06-17-2017, 09:55 PM
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my ac findings for those who care to enjoy

Hello all,my 99 7.3 seemed to have low fan airflow and cool (not cold)ac,so I looked to see if evaporator dirty,it was REAL bad,almost 90% plugged,from PO,I then had the fun job of pulling fan and making a copper tube attached to garden hose to blow it out,took an hour but my vents blew much better,then on to warmish ac,I went to napa and got a heater hose shut off valve for 15$ and that alone dropped my vents 10 degrees so making progress,then I cleaned condenser out real well,another 2 deg maybe there,then put gauges on ac and sure enough low pressure,after a few cans of good ol 134a we are off to the races with max ac at 93* outside ambient and vents putting out 48* BRRRR.The best thing is in vent position it was adding heat from htr core at coldest position,with heat valved off now I can be in vent alot more on cooler day,yippee.
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Old 06-17-2017, 10:32 PM
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Awesome ! I too suffered from my air flow not being strong. I had replaced my fan motor years back and thought the new fan was just not up to snuff with the oem one since i got a off brand fan.
So last weekend i pulled the fan to check the evaporator. Yep stuffed full of crap. So i shop vaced out what i could using some homemade attachments. Then on to the simple green mixed with a little aluminum brightener bath via a pump up sprayer and a good high power rinse. Then a nice shot of 140psi air to get the thing dried out.

AMAZING what some TLC will do to the air flow.
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Old 06-18-2017, 12:18 AM
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Ensuring Air can Flow across Condenser/Evaporator is ESSENTIAL to good cooling. All my vehicles get cleaned annually!


"Most" A/C issues with these systems can be attributed to the following order:

Air Gap / Clutch

High/Low Pressure Switch (These are notorious for one next to the Oil Dip-Stick Connection)

Proper Amount of Freon and PAG Oil (too much, or too little, something will fail in time). "Most times, if your compressor is on/off quickly, repeatedly, this is where to look first with Gauges and a Temperature/Pressure Chart

Condenser Blockage Internal/External

Evaporator Blockage Internal/External

Orifice Tube Blockage - Internal

*Internal is almost always an indication of Compressor Failure / Replace Compressor, Flush Lines, Replace Dryer, Condenser, at a minimum*

Receiver Dryer Full

As for the older units, there is no isolation valve for the Heater Core. They depend on a "Good Operating Blend Door". At this age, they all suck by now. Adding a valve is definitely a consideration.
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Old 06-18-2017, 05:39 PM
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Are you saying a garden hose and water, in the (under hood) fan access area, does not leak into the cab?
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Old 06-19-2017, 12:06 AM
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I replaced my compressor, accumuator and orifice a year and a half ago, flushed everything else, and it was good for awhile. Then it had a hard time keeping up on 100 degree days, so I threw the gauges on it and found the high side was too high. The orifice was plugged from deteriorating 17 year old hoses. Now everything but the evaporator is new and I'm getting 48 degrees around town and 40 on the highway in 115 degree AZ weather.





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Old 06-19-2017, 10:31 AM
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Quote:
Originally Posted by 3wildboys View Post
Hello all,my 99 7.3 seemed to have low fan airflow and cool (not cold)ac,so I looked to see if evaporator dirty,it was REAL bad,almost 90% plugged,from PO,I then had the fun job of pulling fan and making a copper tube attached to garden hose to blow it out,took an hour but my vents blew much better,then on to warmish ac,I went to napa and got a heater hose shut off valve for 15$ and that alone dropped my vents 10 degrees so making progress,then I cleaned condenser out real well,another 2 deg maybe there,then put gauges on ac and sure enough low pressure,after a few cans of good ol 134a we are off to the races with max ac at 93* outside ambient and vents putting out 48* BRRRR.The best thing is in vent position it was adding heat from htr core at coldest position,with heat valved off now I can be in vent alot more on cooler day,yippee.

Are you cleaning just the side you can get to by taking out the fan? Were you able to clear the other side too?
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Old 06-19-2017, 10:35 AM
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Nice work! There is some good information on cleaning in the link I started a while back which I have pasted below.

https://www.ford-trucks.com/forums/1...stem-seal.html

I have yet to get this done, but do plan to do up how to video when I accomplish the task.
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Old 06-21-2017, 10:07 PM
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Yes by pulling blower under hood(vacuum pump is a little in the way,I pulled mine out to get fan out of housing)i used a mirror on a pivot to see whole evap as i cleaned with water,if you go in short bursts the evap drain takes it away to ground,I did stuff a few rags in area that goes in cab but no water made it in there,it smells better too.I had my boy run all blower speeds while running it in my hand and it hauled *** so I new motor was good just bad flow.
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