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What can I do to keep it cold?

[email protected] on Sat September 06, 2008 5:44 PM User is offlineView users profile

Model: Ranger
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.

94RX-7 on Sat September 06, 2008 7:03 PM User is offline

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.

GM Tech on Sat September 06, 2008 7:48 PM User is offline

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......

[email protected] on Sat September 06, 2008 9:30 PM User is offlineView users profile

Quote
Originally posted by: 94RX-7
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.


The entire system has been replace almost 5 times in the last month. Dont ask! haha!!! Oh hell ill give you the short story.... Basically every shop and there mother including my self thought the compressor because it kept coming on and off everytime I replaced it. They though it was the brand because it was cheap. Turned out the wiring harness that goes to the compressor shorted over time out due power steering fluid eating away at the wires. The pressures are reading normal and it definitly cools down a bit when you spray water on it. There is really no restriction though. so I think I may just ad an electric fan to the condenser and ditch the fan clutch and run an electric fan on the radiator also. Also noticed the little door for the max air is not opening.

mk378 on Sat September 06, 2008 9:59 PM User is offline

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.

[email protected] on Sun September 07, 2008 1:52 AM User is offlineView users profile

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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