My truck sat over this past weekend and when i fired it up this afternoon i noticed it took a couple minutes to start blowing cold air. is this normal? do these trucks have some sort of startup delay to prevent damage to the a/c compressor when it has not been used in several days?

 

It takes a couple of minutes for the r134 to get cold. Normal.

 

is that why when you run the truck everyday you dont have this delay?

 

Mine ALWAYS takes a couple of minutes. Sure you just not being impatient today? Could be it needs topped off. My experience with all my vehicles and I've owned about 30 of them is thats normal.

 

I could just be impatient. I could swear it gets cold faster than it did today. I also heard a clunk that was the compressor engaging then it began to cool. Maybe im just crazy.

 

Give it a few days if the symptoms continue worry about it.

 

Like i said i think it might have had something to do with the truck not running for a couple days.

Also can i check the charge easily? this is something i have been meaning to learn how to do.

 

you can buy a kit at autozone or other car parts joint. Get the one with the gauge follow the instructions. Yes its simple. Don't overfill it.

 

It does not take R134a several minutes to get cold. That is not how the system works. Heat transfer can begin within several seconds of the compressor clutch engaging.

The clutch is controlled completely by the PCM on the 07. The PCM "decides" when to turn it on via the A/C relay based on a number of inputs to the PCM. If there was a delay in the clutch's engagement, then there is something electrical that caused it.

Steve

 

Could be after sitting the truck needed longer to warm up for the pcm to engauge the compressor. I would see if it does it tomorrow morning.

 

I think this is what happened more than the R134a taking several minutes to get cold.

Steve, I think it could be normal, there is probably certain parameters that has to be met for clutch engagement and when the engine has not been run in several days those parameters take a minute or 2 to be met.

Can any Ford tech confirm my thinking?

 

Question: "What do you call a recharge can with the gauge on it?"

Answer: "A bomb."

With newer vehicles having variable displacement compressors that adjust to lower quantities of refrigerant, this is not the smartest thing to do. You most likely will NOT get the proper readings without the proper equipment, which involves more than said bomb.

Simple? Hardly.

 

Unless you have a set of manifold gauges!

 

You have a 07 which undoubtedly is still on warranty. I'd address your concerns with the dealer and don't even attempt to service the A/C yourself.

 

My 07 does the same thing.When I start the engine and turn on the a/c it blows warm air until I actually start driving the truck.