Looking for A/C tech

[fabiodriven]

Yous guys is friggin great! What an overwhelming amount of ideas, thank you all so much!

Outlaw it's an (early) 99 F-350 Super Doody with the venerable 7.3 Powerstroke diesel.

[barnett468]

.

Here's some general guidelines for what the pressure in the lines should be with a rotary compressor. They will be different and greater with a piston compressor.

http://rechargeac.com/how-to/ac-system-pressure-chart


Also, if the system is charged with the correct amount of freon and it does not have a massive leak, and there is only around 80 psi of difference between the high side and the low side or less than that, the compressor and/or expansion valve is bad.



PREVIOUS KAWASAKI INTERNATIONAL R & D PROJECT ENGINEER AND ATV DEPARTMENT SUPERVISOR AND THE ONLY PERSON ON 3WW WITHOUT AN EDIT BUTTON OR A STAR

[El Camexican]

Doody

You said Doody!

[big specht]

Don't be a Nancy just roll your windows down. That's a lot cheaper lol

[wonderboy]

I've been googling it trying to find out for sure, but make sure you aren't OVER charged. Many vehicles do have either discrete high and low pressure switches, and some have a pressure sensor (continuous reading). The switches and sensors are there to make sure the compressor isn't running without refrigerant (and thus no lubricating oil) or with too much refrigerant (in which case you could over pressure something).

Since you're A/C was working just fine before, and given that it cut out on you once things got hot, my vote is for an overcharged A/C system.

It is a very basic check to make to measure the high and low side pressures with the system operating. You should be able to find a table that says if the outside ambient temp is X, your high side pressure should be in a particular range, as should your low side pressures.

Like this:

[fabiodriven]

Fantastic replies boys, that's just great. I had the inclination it might be overcharged as well.

[barnett468]

Fantastic replies boys, that's just great. I had the inclination it might be overcharged as well.

Are you suggesting that he didn't look up the amount of freon it takes and he just filled it up until he thought it was fine?

If this is the case, it is a huge no no. I based my reply on the assumption that since he had an ac machine, he knew enough to look up the amount of freon it takes.



PREVIOUS KAWASAKI INTERNATIONAL R & D PROJECT ENGINEER AND ATV DEPARTMENT SUPERVISOR AND THE ONLY PERSON ON 3WW WITHOUT AN EDIT BUTTON OR A STAR

[fabiodriven]

I'm going back to the shop tonight and using all of this fantastic information we'll be able to figure something out I'm sure. I'd just like to check and compare pressures and find where that orifice is if anyone might have an idea. I'm figuring at 17 years old it's most likely going to need a compressor, condenser, evaporator, and probably all the switches. No sense in dicking the dog.

[barnett468]

I'd just like to check and compare pressures and find where that orifice is if anyone might have an idea.

Which "orifice"?



PREVIOUS KAWASAKI INTERNATIONAL R & D PROJECT ENGINEER AND ATV DEPARTMENT SUPERVISOR AND THE ONLY PERSON ON 3WW WITHOUT AN EDIT BUTTON OR A STAR

[fabiodriven]

Well I have my preferences but that's neither here nor there...

Seriously though, I think I may have gotten confused with a thread I was reading in the Super Doody forum in regards to cleaning a screen by an orifice or something along those lines...

[El Camexican]

Remember, there's no such thing as a bad orifice just good ones and great ones.

[fabiodriven]

http://powerstrokehelp.com/PSD_commo...asics/2of6.asp

[wonderboy]

If you have the time, and you don't actually figure it out, post up the pressure readings from the high and low sides. Turn the A/C on max cool, fan on high. Post up the outside temp, and the pressures. This alone can tell us a lot. Pressures will fluctuate as the compressor kicks on and off, so report the range (if you can).

Lots of info here about what the pressure gauges are telling you.
http://aircondition.com/tech/questio...ith-Gauges-FAQ

[jeswinehart]

Mine was right on the okay/low line (been 2 years+since I last added a dab) so I gave it a shot.
Did not check discharge air before but afterwards coming out at 38 degree. That will keep me nice + comfy at Trikefest
I'll bring this set up along Fabio and we can screw around with it on your ride if you'd like.
Only two things I have done so far in trikefest check list.
A/C checked and raffle trike loaded.

[big specht]

And put a fan in front of the truck to help move some air across the condenser when you guys are charging it