SOURCE: Heat blows cold when car is idling
You have an air pocket in the cooling system. To bled it out you will have to park vehicle on an incline or jack up the front end untill the radiator cap is higher than the heater core. The remove radiator cap and run engine until warm then hold rpm to about 1200 rpm's and top off coolant level until you have no more bubbles.
SOURCE: coolant doesn't heat up!
the temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???
SOURCE: 1985 toyota celica gts idle when starting
it may be one of the water temp. sensors at the thermostat housing.
also check the plug, wires,distributer cap and rotor.
good luck
22re owner
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