I have a 1991 Ford Econoline van with no heat. Help it's cold out
The heater core cracked. I had someone bypass the core and themostat so i could still drive the van. I installed the heater core and now i don't know what hose goes where and where the thermostat falls in to the loop. Can someone help? Also do i need to flush my system after the install and hoses are in line?
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The water must be able to circulate and there are three main things to stop this from happening.Heater core blockage,thermostat and water pump.
After checking those you must look at the controls under the dash to see if a dampener door is remaining closed.The doors will shut off the heater core from air circulation when using the air conditioning and vice versa. After starting the van switch the controls for temperature from cold to hot and listen for the door to open and close.That's where I would start.Also you have a Heater Control Valve that shuts off all hot water from entering your heater core.If this valve is closed you would get no to very little heat.It's located in the heater hose from the intake to your heater core.
My guess is that it's a plugged heater core. With the engine running carefully feel the hoses leading to the heater core, which is in the firewall. If both, or one of those hoses is cold to the touch your heater core is plugged. This involves tearing down a bunch of the stuff in the dash to reach. It's not a huge deal, but it's a lot of work. If you aren't comfortable with that I would take it to a shop.
Make sure that you have 2 heater hoses going into the dash. These are 5/8" hoses coming from the water pump and going into the top of the engine. The 2 hoses go through the firewall into the heater core. If you don't have the 2 hoses going to the heater core, the previous owner may have it routing itself back to the engine. It the hoses are routed back to the engine, there's a chance of the heater core being bad as well and this is why it's by-passed.