Question about 1998 Chevrolet S-10 Pickup

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Heater 1998 chevy s10

1998 chevy s10 heater blowing cold air. What could be the problem?

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  • Joshua Schofield May 11, 2010

    have you checked the coolant level? chevys are bad for the heater not blowing hot air when they are low

  • Anonymous Mar 29, 2014

    gas goes to the injectors but they wont fire, and the injectors have already been replaced

  • Anonymous Mar 29, 2014

    fuel is going to the injectors but they will not fire

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Wide open hung thermostat can cause this too...continual circulation never allows the water to get hot enough to warm the heater core

Posted on Jun 23, 2009

  • Jeff Barton
    Jeff Barton Jun 28, 2009

    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

Posted on Jun 23, 2009

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SOURCE: 1996 chevy s10 heater not blowing hot air

heater core or leak on cooling system

Posted on Jan 06, 2009

  • 44 Answers

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.

Posted on Aug 21, 2009

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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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I had the same problem that I just fix by flushing the heater core out with a hose.   take the two hoses off the fire wall and put the water to it and let flush.  my heater is putting out 150 dg. F  of hot air.   I'm so excited!  i will stay warm now.

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1997 audi A4 heater blowing cold air


You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.

Nov 12, 2008 | 1998 Audi A4

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