The heater on your 1986 Celica GTS 5 speed 2.0 only works sometimes what is wrong?
Here are a couple of basic things to check: 1-Make sure the coolant level is correct in your radiator and overflow reservoir. 2-Make certain the thermostat (in the water outlet housing) is in good working order. This should be replaced every 24 months because it is cheap/easy insurance that your car's cooling system will run well. Also, make sure that the thermostat in the car is the correct one (with regard to temp) stated in the manual. 3-Are the hoses leading to the heater core (in the engine bay) swollen/damaged/old? 4-Is the actuator arm/servo/solenoid for the heater core bypass functioning correctly? Basically, when you "turn on" the heater, something has to physically open/close the coolant bypass valve to the heater core to allow warm/hot coolant to flow into the heater core (under your dashboard). If this process is electronically controlled, it is possible that it is failing to open that valve some times. If it is a mechanically controlled process, the heater bypass may be obstructed. 5-Heater core may need replacing. If the heater core has a lot of build-up in it, the coolant will not circulate as easily as it should which can cause the heater to not function properly. There is probably more to check, but its nearly 3am and Im not thinking clear enough to proceed any further. Good luck.
If a 2000 Grand Am sometimes has the heater blower working and sometimes it won't, the problem could be with the heater relay switch. The heater relay switch lets the heater blower know when to come on and when to go off. In most vehicles this switch is behind the glove compartment. This part sometimes gets corroded from condensation in this area.
the heater of your car does not only work when the car is in motion. it only works when the engine is started. you don't have a heater in your car like you do your home. the heat that you feel when you turn on your heater in your car is produced by the engine. and there for if your car is not on then you will not receive any heat. some cars take longer…
Replaced heater fan multi speed in 1992 Olds 88 When turn car off the fan still runs Is it not hooked up properly. I replaced the heater fan itself.?
now when you say replaced heater fan multi speed are talking the fan or the switch because ther is a fan speed resitor that can go bad and fan only works on high speed which can cause conector to get very hot and cause insolation on the wires to melt and cause a short in the harness making fan run constantly.