While idling it blows out cold air with the heat on going down the road its hot pulling up to a stop light or inthe motion of stopping it blows out strong but the more i let off the gas the cooler it gets & the gauge is middle way or a little better can you help 2003 ford f250
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On a vehicle 11 years old, I would say put gauges on it & then leak test it. Most likely has a leak & is low on refrigerant & when you move ,you put too many BTU's across the evaporator from the cabin & it is not at 40 degress to remove the heat
The best and faster way to heat a car up is to drive. I know that it is a cold ride but that is the fastest way.---------------------------------------------------------------------------------- elm 327 bluetooth
Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.
I think what happens is that you're burning out the compressor. If you got the windows down while you're blowing the a/c? it's working over time which is why they have two cycles. The image that displays the circle motion is meant for the windows to be up and the charge will last longer and with the windows down...click the one that shows outside air coming into the car. It might not be as cold as the other option but at least you'll have some cool air while you're at it.
Cooling System Mix
Coolant level low or flow is restricted.
Thermostat stuck closed
Heater Control Valve
Leaking or defective heater control valve.
here something to help u
ok here we go and you aren't going to believe it...
I replaced the thermostat step one
I noticed that I had a small leak at the engine side of upper hose fixed that by taking it off and cleaning it and putting the hose back on Step two
then while refilling the reservoir with coolant i found that the hose that was supposed to be in the fluid was curled up on top and not sticking down in the fluid where it should be.
played with the hose until i got it to fall down in the reservoir where it should be Step 3
I started the car with the radiator cap off and let it run until it got to normal operating temp. and keep filling the radiator with fluid until the level stayed constant. Then put the cap back on and test drove. Everything worked fine haven't had that much heat in awhile and it kept blowing hot even when i stopped and let it idle for ten min.during test drive. Checked reservoir when I got home and had to add a small amount of coolant but not much.
I really think that the hose in the reservoir not being in the right place and pulling air into the system instead of coolant is the real culprit of this drama, but i replaced the thermostat to be safe.