Question about 1988 Toyota Pickup
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Posted on Jan 02, 2017
the 1st thing is to see if the heater core has flow, check this by touching the in and out hose of the core at the engine firewall, if both are hot then the heater core is ok, at that point u will have to check the blend door to see if it moves, this door diverts the air over the hot heater core or the cold AC evaporator core, it is often controlled by a small special electric motor, it is called the blend door actuator motor, if it fails it will useually fail in the cold air position, to change this motor u must remove the dash.
Posted on Dec 15, 2008
nothing try back flushing heater core, they clog up due to litle water preasure,you might want to flush cooling system if you already havent, hope this hleps.
Posted on Oct 06, 2009
The first thing I would check is the heater control valve. This valve opens when you turn the inside control to heat and allows hot coolant to enter the heater core. If coolant doesn't enter the core, you don't have heat.
This valve is usually located under the hood behind the engine up close to the firewall. It will have coolant hoses attached to it. There should be an arm on the valve with a cable from inside the vehicle attached to it. This cable causes the arm to move, opening and closing the valve. Have someone inside move the heater control and watch this valve for movement.
During the warmer months, this valve is not being opened and closed, and it can get stuck. Moving the arm a few times will probably get it working again.
Posted on Oct 20, 2009
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