so I was driving back home I was doing some moderate acceleration not going to lie. And I came to the stop light and all of a sudden my ac started blowing hot and the engine sounded like it was going to die. Kept driving home i was about a mile away and turned the ac back on and was blowing back cold. Then all of a sudden the trick sounded normal no signs of it dying. It was hot yesterday so maybe it overheated ?? When jt overheats will it stop the ac from blowing cold ? Forgot to mention i was on low fuel as well at about the red line on E. F150 2002 4.6 thanks

 

Were there any signs of the truck overheating? What did the temp gauge read?

 

the gauge was at normal, ive never had any experiences with it overheating. I heard these trucks have some failsafe when they overheat and the ac shuts off and some cylinders shut off not sure if that's true. Maybe it overheated not sure. After the stop light I drove half mile turned the ac on and the truck sounded back normal.

 

The owners manual for my '99 speaks to fail-safe cooling "if equipped". I don't know if my truck has it or not. It does state that the engine will go into alternating cylinder operation so every non-operating cylinder acts as an air pump to cool the engine, and the AC will be disabled. However, it also says that the temp gauge will go into the red and the oil pressure and coolant lights will come on, none of which appear to have happened in your case. So I guess the jury is still out. Interesting, though, that your symptoms sure seem consistent with fail-safe cooling. Good luck and here's hoping your problem is a minor one.

 

Yeah man its hella weird I was at the light then all of a sudden warm air and engine sounded odd. All gauges whete normal no temp light or nothing. Maybe the ac compresor locked up or something? And caused the engine to idle poorly

 

A/C doesn't usually blow hot and cold. Likely the compressor was shutting off for some reason. It will shut off if overheated, you should have had a temperature warning light though if it got 'that' hot. Hi RPM may shut off the compress too. I don't know if they still operate that way like they did back in the days.

If it's working fine now, then probably nothing to worry about. And will be impossible to diagnose why it tried to stall and why the A/C compressor shut down during that one instance.

Guaranteed it didn't 'over heat'. It may have neared Fords high temperature standard but you wouldn't have been driving it home had it overheated.

 

Welp if it does happen again ill have to get it diagnosed. I would say my fuel pump is probably bad but should of affected the ac going from cold to warm

 

Again, if A/C is blowing warm then cold you would have an issue with the charge.
The A/C compressor shutting off is likely the culprit. I don't think is at all an Air Conditioning issue.

Fuel pump generally works or it doesn't. It's very uncommon that the fuel pump decides to flow "less" fuel.

 

So it happened again where the ac started blowing warm air and the truck sounded like it wanted to die. I drove it for a few yards and everything is back to normal. Ac blowing back cold. I feel like the ac compressor locks up and makes the truck idle horrible ?

 

Take the belt off and inspect the compressor.