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Do your research. Don't rely on one manufacturer's claims. Diesel's work on precision. Any time you change something in a diesel engine it affects everything else, for example, shoving more fuel through the injectors can push them beyond the built in tolerances and lead to premature wear. One of the best authorities on diesel performance is Banks. They have been at it for a long time, GM recognized them as such in the early 80's. Trust what they tell you.If they don't offer that type of chip or performance chances are there is a reason.Hope this helps.
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
The IAT or MAT sensor (as equipped), is a thermistor (resistor which changes value based on temperature) mounted either in the air intake snorkel or the manifold (depending on the application).
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