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There could be multiple reasons why a heater would stop working in a truck. There could be low coolant or a bad fuse to make a heater stop working in a truck. The best way to find out the reason is to take it to a certified auto mechanic.
Could be the heater. It's likely that most of the hoses to the rad were changed, but maybe a hose to a heater (if you have more than one), or the heater itself.
Blown Heater Core - The heater fan blows past the heater core and if it has a hole in it your antifreeze ios being blown onto your windshield.
heater core possibly plugged and leaking
heater coil
No! Thermostat.
Cracked injector cups.
1- Drain coolant. 2- remove heater hoses from core inlet and outlet pipes in engine compartment. 3-remove screws and heater core cover. ( right side lower passenger compartment ) 4- carefully lower core out of heater unit. This old of a truck it would be wise to replace both heater hoses. Use antifreeze as a lubricant to install heater hoses to new core inlets.
heater core???
I would check the hoses leading into your radiator, and also the overflow for antifreeze. If that is not the problem, it could be your heater core. Your heater core might be leaking, you might have a hose leaking
The heater core is cracked. You may also be smelling a sweet sort of smell when you turn on the heat and the car is running hot. That sweet smell comes from the anitfreeze when it burns. I have a 1998 ford Expedition and I smell antifreeze inside the truck. also antifreeze leaking around the passenger side of motor outside..... I can see a mist coming out of the ac vents.... could it be bad heater core and is it easy to fix or do you have step by step removal/installation instructions? please help Your heater core is probably cracked. There is alot of work to get to the core. You have to remove the front dash board.
I have a 02 buick rendezvous mine would blow a lil heat but never would get hot. We had it checked it was the thremostat, that is what was wrong with mine. They told me there is three things it could have been , it could be low on antifreeze , thremostat, or if you have to keep adding antifreeze often then it is your heater core.