Question about 1999 Chevrolet Blazer
Have checked heater core by taking air hose and blowing thru to other side no leaks does not overheat no lights come on just no heatany help would be appreciated BRRRRR
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
Could be the thermostat, or the blend door actuator. If it's not low anti-freeze. It does blow air, correct? If not, check the heater fuse or the blower resistor. Take care and best wishes to ya.
Posted on Jan 26, 2009
Make sure you are full of antifreeze to the top of the radiator .. also your water valve is working properly isnt it ? sometimes they are outside firewall and are vacuum operated. lets water go inside the core.
Posted on Jan 25, 2009
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Posted on Jan 02, 2017
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