Question about 1998 Chevrolet Blazer

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The blower on the heater works but no heat comes out just cold air, already changed the themostart and plenty of antifreeze, I had the system flushed and had a new heater core and nw radiator put in and it still justsblows cold air . Any suggestions would be helpful.

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  • Contributor
  • 28 Answers

Sounds like all key components have been replaced, so I think the blend door in your air box is not switching, if you can switch selector and get air at defrost, panel and floor, but all cold, the blend door connected to the heat / cool control is not actuating. DW Mylin

Posted on Dec 02, 2012

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Posted on Jan 02, 2017

  • 147 Answers

SOURCE: Heating problem

Does the defrost work.

Posted on Oct 22, 2008

  • 2 Answers

SOURCE: no heat 1997 chevy lumina

open pasenger door there on side of dash or unde hood neer driverside windshield

Posted on Feb 10, 2009

  • 104 Answers

SOURCE: No Heat! 1999 chevy blzr lt 4.3 radiator full, blower works,

Your '99 Blazer does not have a water valve. Just a temp. blend door. In other words, hot water should be flowing through the core at all times. Like the other techs said, make sure you are getting the whole system full of coolant. You might even try disconnecting one hose, and pouring water into the heater core itself. On most of these year models, if you listen, you can hear the rush of water through the core when you lightly rev the eng. I have replaced 3 heater cores just last year on '96-'99 Blazers. They clog easily. YOu can blow or flow water through them, but if they don't flow freely, I mean without any restriction whatsoever, they will not get as hot as you want. The thing is tiny!

Here's an easy test: Run engine until temp gauge reaches normal: around 180-200 degrees. Reach back to the firewall and grab both heater core hoses. Are they both about the same temp. and HOT? THey should be. If one is much warmer than the other. You are clogged enough to suffer in the winter. And from what you said: "Brrrrrr" You are getting poor performance out of your heater.

BE sure to check that the blend door is working. Is it cool when you set temp to cool? Blazers go through way more heater cores than they do blend doors, so I'm betting your core is either empty, or clogged. TaterTodd

Posted on Jan 28, 2009

babaphat
  • 24 Answers

SOURCE: chevy astro van heater blowes only cold air

the problem is probably the heater core, it can become clogged with dribris. this stops heat from the engine getting to it and then no heat.

Posted on Dec 08, 2009

  • 30 Answers

SOURCE: Heater blows only luke warm air.

check control swicth

Posted on Feb 12, 2010

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