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Re: truck wont run after it gets hot
OK...I'm going to assume it's an automatic trans and it will not shift? If so, first place I'd look is inside the trans pan. If the oil is severely burned and contaminated with either metal or clutch material, STOP there and get it to a trans shop for a rebuild. If discoloured and mildly contaminated, change filter and fluid, add a good conditioner and see if it helps. If it does nothing helpful after driving or testing/driving for an hour or two, likely it has either a control or internal pressure problem...again,,,work for a trans shop.
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The A/C causes the engine to work harder (that's why fuel economy suffers when it is run).
If your car has an electric fan - make sure it runs when the engine is hot. If it does not - you may have trouble w/o the A/C running if is gets warmer outside. Look for fail fuses, disconnected plugs, etc.
You may also have flaky thermostat that is not opening fully when needed to exchange hot water in the engine block with cooler water in the radiator.
First, check the coolant level. You should find a semi-transparent reservoir / tank located under the hood that has a cap marked "Coolant". The side of the tank should have two indicator lines - one for HOT and one for COLD. If the engine has been run up to normal temperature (so that it can provide heat in the car), you should see the coolant level at or slightly above the HOT line. If the engine is cold - first thing in the morning or after sitting for several hours - the coolant should be at or slightly above the COLD line. View these levels while the engine is off and the car is parked on a flat, level surface. If there is not enough coolant - you will need to add the CORRECT type for your car.
(1) With the engine hot, add enough coolant to the tank to bring the level to the HOT line. You may have to check the tank several times after driving if the coolant level in the radiator is down a great deal. NEVER open the radiator cap when the engine is warm or hot!
(2) With the engine cold, add enough coolant to the tank to bring the level to reach COLD line. Additionally - with the engine cold - you can add coolant directly to the radiator by removing the cap. Start the engine, set heat in car to HOT and add coolant mixture to radiator until level comes up to the bottom of the filler neck. Once the engine is HOT (getting heat in the car) check and top off radiator as needed and put cap back on radiator.
Check the levels in the TANK several times over the next few days when cold. If the tank ever empties -you'll need to have this looked at by a mechanic.
check anti-freeze level if you have a slow leak and level is low the heater core wont have fluid enough to supply the heat as fan blows through it and would also explain running hot if thats good have thermostat checked and changed for a lesser temp. shouldnt cost more than 25 parts and 1 hr shop time
Normally, if an engine is running hot and the heater is blowing cold air that means that the coolant level is low. Make sure the radiator and overflow bottle are full. Leave the cap loose for a day or two and keep topping up the coolant level. This should bleed out any air and give you back your heat. If it is still running hot then you will probably have to change the thermostat. It should be changed every couple years irregardless if it is still working. Hope this helps.
Check the coolant level, it could be as easy a fix as adding coolant because it's low. Low level causes engine to overheat, and low level won't circulate to heater core, so no heat situation even though engine is running hot. Let me know if this fixes it, if not I'll help .