1999 Ford F-150 Low pressure line

  • 3 POSTS
  • 1999 FORD F-150

Air Conditioning problem
1999 Ford F150 V8 Four Wheel Drive Automatic 95000 miles

Where is the low pressure inlet to recharge with 134 refrigerant, the AC only blows hot air

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have the same problem?
Monday, May 31st, 2010 AT 10:24 AM

1 Reply

  • 29,772 POSTS

Hi Firekev. If you don't know the basics of AC systems, it is fair to warn you about the dangers of working with refrigerant. If you never wear safety glasses for anything else, now is the time to start. Better yet, use a face shield. Vaporizing refrigerant will freeze eyeballs and cause frost bite.

Always charge with the can upright so the refrigerant boils off and enters as a vapor. Liquid refrigerant will lock up the compressor and could permanently damage it. Only Chryslers and Fords use a sight glass to allow you to know when the system is fully charged, but on Fords that sight glass is useless. There will still be bubbles in it when the system is fully charged. Over-charging in an attempt to eliminate the bubbles will result in the liquid turning to a vapor, (that's where the cooling takes place) under the hood, not in the dash. Liquid could also slosh into the compressor causing it to lock up.

The low side port is on the hose going from the firewall to the compressor. R-134 hose connectors are different. The charging hose that comes with the one pound cans will only fit the low side fitting. If the can doesn't fully empty in a minute or two, place it in a pot of hot water. That will make the can empty in 20 - 30 seconds. Always keep it upright so only vapor enters the system.


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Monday, May 31st, 2010 AT 1:01 PM

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