Question about 1998 Chevrolet Blazer
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
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
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
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