we have a similar problem with an 89 toyota corolla but replaced the thermostat

F

Frank

New member
with no results. still cold? we replaced the thermostat but the engine is stilling running cold with no heat to the cabin
 
Is the coolant/antifreeze not getting warm or is there just no heat in the car? Coolant warm but no heat is usually a bad heater core.
 
The engine is hot, the heater core is not.
Coolant is not flowing through the heater core.
Toyota uses a flow valve to allow the coolant to flow through it.
The valve is probably stuck.

Follow the heater hoses until you find the valve and see if it's stuck.
Maybe even replace it, or back flush your heater core. Maybe it's plugged?
Or maybe the blend door in the heater box is stuck?

It could be a number of things.....
 
The engine is hot, the heater core is not.
Coolant is not flowing through the heater core.
Toyota uses a flow valve to allow the coolant to flow through it.
The valve is probably stuck.

Follow the heater hoses until you find the valve and see if it's stuck.
Maybe even replace it, or back flush your heater core. Maybe it's plugged?
Or maybe the blend door in the heater box is stuck?

It could be a number of things.....
 
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