a/c quits working under a load!!!
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a/c quits working under a load!!!
when i put my truck under a load the a/c blows hot air!!! it only does it when i go up hills or when i pull my trailer,its a 99 f350 crew cab diesel 4x4. ive replaced the condenser and expansion valve but i have the same problem.... any help out there?
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a/c quits working under a load!!!
Originally posted by fito1411
when i put my truck under a load the a/c blows hot air!!! it only does it when i go up hills or when i pull my trailer,its a 99 f350 crew cab diesel 4x4. ive replaced the condenser and expansion valve but i have the same problem.... any help out there?
when i put my truck under a load the a/c blows hot air!!! it only does it when i go up hills or when i pull my trailer,its a 99 f350 crew cab diesel 4x4. ive replaced the condenser and expansion valve but i have the same problem.... any help out there?
Originally posted by Jeff Hamilton
The A/C is designed to cut out under Wide Open Throttle.
Jeff Hamilton
The A/C is designed to cut out under Wide Open Throttle.
Jeff Hamilton
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From: AZ
a/c quits working under a load!!!
Originally posted by Jeff Hamilton
Two reasons 1 If your foot is on the floor you need all the power you can get.
2 They don't want the A/C compressor spinning as fast as you can spin the motor.
Jeff Hamilton
Two reasons 1 If your foot is on the floor you need all the power you can get.
2 They don't want the A/C compressor spinning as fast as you can spin the motor.
Jeff Hamilton
Thanks for the help, JEFF!!
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a/c quits working under a load!!!
I don't know why it didn't do it befroe. If you keep your foot just off the floor it will stay on.
Jeff Hamilton
Jeff Hamilton
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a/c quits working under a load!!!
It's a little more complicated than that. I too had,have the same problem. A mier $250 later for the shop manuals from Helms and the problem became a little more clear. The PCM or powertrain control module is responsible for operating all the extra goodies. This device recieves a variety of signals and makes descisions as to what to do. In some cases such as high temperature it will shut down the compressor. Sadly the only way to determine if the PCM is the problem is to connect the truck to the World Diagnostic System or equilivent scan device to see what is going on in the PCM. Several other areas can also cause the same problem, these are mostly electrical in nature (such as bad connections, pressure swithces, etc). Good Luck
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a/c quits working under a load!!!
Brian is correct. Although you can do it without WDS or NGS it just a little more work. You can check the A/C pressure switchs with a test light or Digital Volt Ohm meter. If you are low on coolant or the coolant temp sender is giving a bad reading it can also be checked with a DVOM. Since you said you had the problem under a load the WOT switch was the first thing to come to mind. The ECT (engine coolant temp) is a good place to look also. On a gasser the IAT(intake air temp) and the ECT should have about the same ohm reading (I just got my first diesel but think it should be the same ).
Jeff Hamilton
Jeff Hamilton
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a/c quits working under a load!!!
I had the same problem with my A/C guys. I got with the local PSD air condo guy, and he told me to check voltage at the compressor when this occurs. If there was voltage present, then the electro field inside the compressor was bad. It happened, I pulled over and checked voltage. The new field was $45.00 and 1 hour of labor. first time I had a bill of only $100.00 on this thing. Another trobleshooting tip, was that when my a/c cut off under load, all I had to do was turn overdrive off. the rise in RPM's would cause a/c compressor to work again. try that, if it works, get it in for electro field inside compressor. The F-350 2002 model does not require the freon to be evacuated prior to this fix. good luck.
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