Only had this F150 for a few days, but the A/C won't blow cold at idle, no matter what setting I have it on. Granted it's miserably hot and humid here right now, but once underway it blows really cold. But sitting, it won't blow cold air. Just curious because my previous vehicles never did this to this extreme.

 

Could be a weak fan or fan clutch, what year?

 

What is "this F150"? Could be numerous things including "expected".

 

2008 SuperCrew 5.4L, 4WD, automatic.

 

Sitting in traffic is miserable, AC won't blow cold moving slow or stopped.

 

I believe 2008 has electronically controlled fan clutch. It *should* throw a fault code if its not working properly.

Have you had the refrigerant levels checked?

 

I have a 2006 F150, 4x4, auto. EXACT same problem, I thought it would be the fan clutch. No codes.

I'm about to order a fan clutch and replace it. Am I going the wrong direction here?

 

2006 should have standard thermostatic clutch IIRC, so you won't ever get codes on a system like that

 

Is the compressor running at idle? It may not be due to low refrigerant. Check the low and high side pressures.

 

Low refrigerant. Needs a recharge. Go to local automotive and buy kit. Shake well, connect hose to truck, turn upside down and squeeze trigger. There is a dial you need to set for ambient temp. That will give you your pressure range.

 

I have an 06 FX4 5.4 and I have the same problem...I have had the fan clutch replaced and that fixed it for a little while but on those really hot muggy days here in Tennessee if I am idling it wont blow cold system is supposed to blow 30 -40 degrees colder than ambient.... per the manual ...I am considering an aftermarket ac system I am sure its really $$...maybe a new serpentine belt?

 

No auto AC system is going to blow air as cold at idle as it is when driving down the road at some speed. But, it should still be cool at idle. If it isn't, get the low and high side pressures checked because it is most likely low in refrigerant.

 

Yeah, mine blows cold while running down the road, but once you stop at a redlight, traffic, etc, it blows warm air. It's very annoying here when it's 98* out!

 

About how much should I expect to pay to have someone drain and refill the A/C coolant? I have the stuff to add refrigerant here at home, but the "gauge" is showing in the yellow area, which it says indicates a problem.

 

It doesn't need "draining". The low and high pressures should be checked and if they are low, some refrigerant should be added until the pressures are proper.

Check to see if the compressor is running at idle. It probably isn't.