Question about 1999 Chevrolet Blazer

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Heat NOT blowing out ANY air consistently!!

We switched out the resistor to see if it was a simple quick fix, but it still only works very randomly (though blows perfectly hot air when functioning). Is this the blower motor or possibly an electrical issue?

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  • Glenn Robinson
    Glenn Robinson Nov 13, 2014

    Hi Marta McGuinness, I want to help you with your question, but I need more information from you. Can you please add details in the comment box? Replacing any electrical part in car Newer than 1986 ++ up one needs to always RESET onboard computer by disconnect battery 20 min. - 30 min. Have you Tried this ????

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  • Contributor
  • 23 Answers

Can be blower motor easy to test --remove it look for imbalance by spinning to check bearing smoothness / freeplay . Hook up ground then use inline fuse connector with lower than fuse panel ## number of fuse -- find power Eg .car battery -- be sure to ground then connect Fan to visually see it spin .. NOW if you have any type of electronic dash mounted controls for heat / air conditioning - most likely electrical issue is in it . you said blower motor does sometimes function - Test wires that plug in to it for power / find groung then probe by test light when in heat mode = switch to air cond mode if fan functions then problem in controls on dash .. if no test light reaction search wires for short or damage .. As FUNNY as it sounds I have pulled mouse nest out of GM heater fans - They access parked vehicle by drain hole inner fender well it drains water from wiper blade / heater vent area .

Posted on Nov 13, 2014

  • Marta McGuinness
    Marta McGuinness Nov 13, 2014

    thanks! will definitely try that out!

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SOURCE: '98 S-10 heater blowing cold air - not hot air

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SOURCE: Where is the blower motor resistor on a 2003 Chevy Malibu

Remove the shroud below glove box, 2 screws and a snap-pop fitting. Be careful of the courtesy light. Remove the blower moter and disconnect the purple/black power connector to it - - you'll need this extra room to work with. 2 more screws, same size, 6.5mm on mine, 7or 8mm on some others, that holds the blower motor resistor in place. This replacement part is less than 40 bones at most parts store. Unplug, replace, re-install, test and you're on your way with about 2 hours of slow paced effort in your own driveway. Typical cost at a garage - up to $400, what a sham.

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SOURCE: Air randomly blows hot on left, right or back of 2004 Suburban

check the AC relay...not the fuse but the relay

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SOURCE: 2005 tahoe dual climate control, driver side blows HOT air.

You will need to replace the drivers side temp actuator. It is available at your local dealership.

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SOURCE: my vent only blows hot air. The air conditioner

check cabin air filters located in the rear of the glovebox there is a cover then a small door to access them

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