Engine Size: 4.0
Refrigerant Type: R134
Country of Origin: United States
Hi! I am having a small issue with my A/C in my Ford Ranger. In the mornings my truck gets nice and cold when I'm driving it. Once it warms up during the day to 90+ It doesn't stay very cold while driving for short periods at a time or while sitting at a stop light. Once I get going and have been driving for a while it starts to get cold again. I'm assuming this could be normal because of the outside heat? I tried the different settings on the dash (off, Max air, and normal) and I can not feel any difference. I also notice in the mornings the compressor will kick on and off about 15-20 seconds and once it warms up during the day it just stays running and will kick off just at High RPMs. I was thinking it was low on refrigerant but its not. So now I'm thinking of adding an electric fan on the condenser. Will that help to keep the truck cooler in the cab on the hot days?
Thanks in advance.
Sounds like it is low on refrigerant or there is a restriction in the system, possibly the orfice tube being full of bits-o-compressor. How do you know it isn't low on refrigerant? Hose the condenser down and see if the high side pressure falls off dramatically...if so then you could have an airflow issue.
Sounds like classic clutch fan failure from here... put water on condenser see if it stays cool after it has gotten hot on you..
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
Make sure it's been well evacuated and properly charged by weight. Also after several compressor changes you could have too much oil in the system. I agree it's very likely the fan clutch. Charging by pressure shoud be avoided, especially because doing it when the fan isn't working well causes you to undercharge.
Don't try to replace the engine fan with an electric fan, you'd need a really big fan.
It has 28 oz of R134 and 8 oz of oil which is what was recommended. My truck is not stock (desert 7 open race truck) and has a much larger 100% aluminum radiator. I know its not the fan because it runs at 180 degrees all day long so I was able to rule that out. Main reason I am going to change the fan clutch is to free up a little hp but thanks for the heads up. I had no idea that could really effect it. Anyway what I figured out is the vacuum lines that go to the controls were blocked so there was zero recirculation. The only air I was drawing in was outside air and the little door that operates by vacuum was not opening. Now it blows at 48 degrees at idle. Before it was 62.
Thanks for all your help guys I really appreciate it!!
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