Question about 1998 Chevrolet Blazer

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No heat stoped working blows cool air - 1998 Chevrolet Blazer

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  • 57 Answers

Is the coolant level full? If not fill it. Those trucks are notorious for blowing head & intake gaskets, leaking coolant. Be careful.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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SOURCE: driver side heat blows cool air passenger side

Hello. The side that is not operating properly has a bad temp door actuator located up under the dash. I am assuming this vehicle has driver/passenger(dual)climate control heat and cold settings. This is a very common problem on these vehicles. Hope you find this information useful!

Posted on Sep 20, 2009

  • 1 Answer

SOURCE: air conditioner problem with 2005 chevy 1500 silverado

I have the same problem exactly, if i turn off the ignition and then turn it back on it begins blowing cold air again. I would like to know what the problen is as it sounds like it is not unique to just my vehicle.

Posted on Oct 10, 2009

  • 2 Answers

SOURCE: heater not working right in 1999 silverado

First check the coolant level if the engine is hot check the reserve jug on the firewall--if cold before start up remove the radiator cap and check coolant level add as needed. If the thermostat has been removed it needs to re-installed. It is possible that the heater hose(s) is stopped up. After letting it run for a period of time both heater hoses should be hot to the touch if they aren't something is restricting the flow of coolant the system needs to be drained and flushed. I have also see some vehicles form an air lock in the coolant system causing the same thing. It then needs to be (burped). This can be checked/done by removing the radiator cap while the vehicle is idleing and watching the water level in the radiator squeeze the upper radiator hose to see if the water/coolant level rises in the radiator. When you release the hose you may need to add some coolant this forces out the air. Hope one of these things. These are some of the cheapest fixes and if they don't work/help then you need to start looking at the heat control selector.

Posted on Dec 30, 2009

  • 335 Answers

SOURCE: driver side heat blows cool

Hello, this is cused by the drivers side temp door actuator. there are two electric motors that move the temp doors from cold to hot. there is one on the drivers side and one on the passenger side. you will need to replace the one for the drivers side.

  • Remove the left instrument panel (I/P) insulator.
  • Remove the knee bolster bracket bracket. Disconnect the electrical connector from the left air temperature actuator.
  • Remove the mounting screws from the left air temperature actuator.
  • Remove the left air temperature actuator.
  • Posted on Nov 06, 2010

    • 271 Answers

    SOURCE: heater not working good

    To warm your car, your car's heating system makes use of excess heat from the engine's internal combustion process. Diagnostic tools for car @http://www.obd2express.co.uk

    Posted on Nov 02, 2012

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    0203@yahoo.comthe van does not heat unless u are moving. when we r stoped it blows cold air and when we move it blows out the heat.


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    i have the same problem on my 84 grand prix..ther is black wire that heat runs through i broke my cause it was so old an dry rotted an the heat stoped coming out the vents but comes through the dash by the winshield

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