Your heater in your truck is blowing out cold air only the car gauge shows the truck is hot?

Answer 1

Radiator fluid takes the heat from the explosions in your engine and pulls it away to cool the engine. This hot fluid then goes through the radiator line and into your heater core under your dashboard. Air blows past the heater core and becomes hot/warm as the heat transfers. If you have a problem with your radiator fluid such as low concentration or poor circulation, the heat will not enter the fluid the same or get passed to the heater core. If you have just water, for instance, the hot water can only go up to 100 degrees celcius before reaching its limit. Engine cooling systems use radiator coolant to remove excess heat from the engine. The coolant usually consists of water containing various additives that reduce corrosion and improve the efficiency of the coolant. Some of the desirable characteristics of a coolant (commonly referred to as anti-freeze) are as follows: Ability to lower the freezing point of water to below the lowest likely winter operating temperatures. Satisfactory chemical stability. Low cost. Ability to protect the cooling system metals from corrosion deposits. Lubrication of connecting hoses. Ability to raise the boiling point of water thus increasing the cooling system pressure. This leads to a more efficient heat transfer by allowing the coolant to circulate at a higher maximum temperature. Radiator fluids generally consist of water, ethylene or propylene glycol, corrosion inhibitors and other additives. You may have one of a few things wrong. 1. You may have a block in your radiator line or a bad heater core. If you do, the hot radiator fluid is not running through your heater core and the air is not transferring the heat from the heater core to your cab, because the heather core is not hot. You may need to replace the heater core or open the blockage in the radiator line. 2. You may have a leak in your gasket in your cylinder head. If this is the case, you will have excessive smoke coming from your tailpipe. If this is the case you need to get pre-mixed radiator fluid ASAP to replace the fluid that has gone into the cylinder area and out the tailpipe. You will smell a fish-like smell if this is being burned in the cylinder and out the tail.