Where is the heater core located in a s-10 truck?
Buried behind the dash assembly.
i have a 93 s10 blazer and had to replace the heater core recently, it is a pain, and it helps to have another person there to give you a hand, you have to take the entire dash out, remove the heater core cover, undo the brackets and undo the hoses from the heater core, the worst part is removing the dash and remembering where all the wires go if you do this job yourself…
Problem is that the heater core is the highest point in the cooling system. being a closed system any air that enters is trapped in the heater core. Result, no heat. Recommended repair is to back flush heater core, refill cooling system making sure all air is released from the heater core. Replacement of the radiator cap at the time of repair is recommended.
I would disconnect both heater hoses from the engine, then fabricate a way to connect a garden hose to one of the hoses leading to the heater, then gently turn on water supply for a minute, then attach garden hose to opposite heater hose and flush again, then reattach both hoses to engine and top off coolant reservoir.
I am pretty sure it is right above passenger side floorboard, up in dash. I have changed heater cores in Ford vehicles, and all of them were above floorboard on passenger side. Locate the heater core, and it should have water lines running into and out of the core. Use wrench, and take lines off of core, buy new core, and replace lines into new core.
The heater core comes out from the inside. If you have air it is a little harder. Remove the dash bolts it does not need to come all the way out. also remove the glove box this will help you remove the heater box which the heater core is behind pretty easy after the dash is out of the way hope this helps