1998 chevy s10 heater blowing cold air. What could be the problem?
Wide open hung thermostat can cause this too...continual circulation never allows the water to get hot enough to warm the heater core
you might have a wide open thermostat which will cause the water to not heat up enough to send hot water to the heater core.
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You need to check your coolant level first. If it is low you have a coolant leak. No hot coolant=No heat
SOURCE: 1998 Chevy S10 pickup air condition compres is on instead of heat
First be sure that you do not have the controls set to defrost the windows since on just about all vehicles nowadays with the controls set that way the air conditioner will be turned on...even if it is not so warm outside. So...be sure that you do not have any of the controls set to defrost and that the heater is turned all the way on.
It sounds like though that the control for the vents is not operating properly. This is a combination of mechanical movements of the vent flaps and small "air motors" that operate the flaps. These air units are controlled by air vacuum taken from the engine compartment through tiny hoses. If the hoses get cracks, holes or come loose from their fittings then your vents will not move correctly so it is a matter of looking and tracing each one of the hoses to make sure they are fastened correctly, have not come loose and are not cracked or leaking. The problem can even be in the engine compartment where the hose(s) connect to the engine vacuum system...so it will take lots of looking carefully with flashlights etc....good luck.
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have you checked the coolant level? chevys are bad for the heater not blowing hot air when they are low
gas goes to the injectors but they wont fire, and the injectors have already been replaced
fuel is going to the injectors but they will not fire
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