Heater problems

To find out if your heater core is clogged, feel both heater hoses (the two hoses hooked on the heater core inlet and outlet at the firewall) with car idling at normal operating temp and heat set on high. Both hoses should feel very hot. If one is cold or luke warm, your heater core is probably clogged. Flush it or replace it.
If you have a heater control valve on your car, make sure it's not stuck close. If you have one, it's probably in one of the two hoses with a vacuum hose hooked to it.

Also make sure your level of coolant is good and make sure there's no air in your cooling system (bleed it).

So your heater blows nice and warm now?

Hi there,

First make sure your coolant is at proper level.
If it is check your heater core. It's probably clogged. One way to confirm this is by turning the truck on and letting it reach normal operating temperature. Then turn heat on high. Now feel both heater hoses in the engine compartment (the two smaller rubber hoses that hook on the heater inlet and outlet on the firewall). Both hoses should feel very hot. If one hose is cold or lukewarm, that would confirm a clogged heater core.
Also, if your truck is equipped with a heater control valve, make sure it is not stuck shut. If you have one it will be probably in one of these hoses I mention above.

Good luck.

First check to see if the coolant is full, if it's not you won't get any heat. Then check tosee if your car gets to normal operating temp. You may have a bad thermostat.

Does the engine reach normal operating temp? Does the blower motor work? Heater hoses hot?

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.