Super Duty owners, I have a question

A/C is to cold! Just put the windows down!

Perhaps the mechanical fan isnt locking up as it should?

 

I have a 98 and a 08 and don't have any issues with my ac but I'm in MN.....ones a 5.4 the other is diesel twin turbo.

 

Funny im taking my 99' F350 7.3L in to get the AC recharged today.. Mine has a leak and needs to be refilled every few years..

 

Do you have a recirculation selector on a 99? If you do try that instead of drawing fresh air from outside. See if that helps before going through the pain of adding a fan.

 

I died everytime i went down there....120 degrees and 100% humidity. Wetter outside the shower than when i was in it.

 

Oh sorry...the ac....the max setting than should recirculate already cold air, in essence not working as hard and keeping it cooler. When you switch between the two can you hear the door switch in the dash? It almost sounds like the blend doors arent functioning properly. You should have one that directs the air through the ac condensor and one for the cabin air. Another thing yhat could affect it is the cabin filter. I always change mine at least once a year. But thats in pennsylvania. Being in Louisiana you might need to change yours more often.

 

^ Exactly!

Use to be a heater control valve operated by a cable connected to the temperature sector that shut the hot water from flowing into the heater core. The fan flow over both cores and shutting the hot water out allowed for max cold air. Cars now flow through constant, no shut off valve but have separate compartments for the cores within the a/c system box under the dash. A blend door seperates the cores compartment. If that door is operated by a vacuum actuator, low vacuum and/or a weak actuator will allow the door to peak open allowing both hot cold to pass through. Stepping on the gas gets vacuum up compensating for the actuators bleed off.

 

Wasnt sure if ford was outta the stoneages by 99 or not lol. All your ac and heat controls should be vacuum operated.......side note, wasnt it you who had the intake off this? Check your vacuum lines

 

maybe your blower motor is loosing its life?

 

ahhhh, missed that. I would check your ac clutch. It may not be engaging and or staying engaged while stopped. Too much of an air gap. I would remove the clutch and pull the shim or washer off bolt and reinstall. Very simple to do and try. Trick is to turn key on with engine off and turn ac on. Your clutch should engage, remove the one bolt and pull clutch off. There should be a small washer or shim you can remove.

 

Have you checked the clutch to see if it is staying engaged at idle? Is the compressor a rebuilt unit? Or oem new?

 

Dude its gotta be the temp blend door. Its not fully opening. Id put money on it