Likely you have air in the cooling system, squeeze rad hose a few times, see if that works out the air pocket. Also, when the car is warmed up just quickly feel the rad hoses to see if they are hot all the way around, usually air will collect in the top hose. Heater core might be blocked but that is unlikely.
There is a air mixer door inside the heat exchanger. It might be stucknopen and not allowing heat to enter csb. You can check this by finding the air control cables under the dash with the vehicle powered on move the hest to hot and cold then move the air control to defrost and inside control like to blow on ur legs you should hear a flapping kimda noise from within the air box. Or a sound like a door moving if you see the ckntrols wherr the cables connect and one is off reattach it and try test again this might be yiur issue .. you can you tube heater cad issues it might help aswell
Have you checked if the blend door actuator is stuck?
Might not have enough antifreeze or can fix by perge air out, or one more thing try flushing the heater core.
SOURCE: i have a 1999 zr2,when you give it cas under a
You didn't say if there was an engine light on. I'd check the t.p.s. throttle position sensor. It could be a jumped timing belt,based on the year , it's got milelage.
SOURCE: Noise in front end 2002 zr2 blazer
Two things maybe your problem:1 .Front axle actuator to engage 4wd is not releasing. 2. Front axle u-joint needs replacing. Lift car on jacks with front end off ground. Then spin tires by hand as fast as you can and see if you hear the noise and where it is coming from ( spin in both directions).
Testimonial: "Thank you! It was the actuator that was causing the problem."
SOURCE: how do I know if the rear differential is leaking
It will be wet around your cover on the housing where your gasket is located.
SOURCE: 2002 Blazer ZR2 - when set to floor heat only HVAC
Hi, there is a plastic line that runs from the mode switch to the intake manifold or reservoir. The small hose that connects that line to the intake is often leaking. If not that, trace the line thru the firewall to the switch. Take the bezel off and pull the control panel out to see the hoses. start the truck and listen to the back of the mode switch for leaks in the connection or the switch itself. If there is a "T" in the line near the switch, check that too. Finally, trace the lines to the mode door vacuum motors to see if any of the mode motors or attach hoses is leaking. In each case, you've got to have the engine running, and it's basically a listening technique, since the leaks is small. You can tug on the lines to see if that will make the hiss louder. A small leak like that is hard to find. Good luck!
SOURCE: 1999 Cadillac DeVille is over heating
Vehicle has a hair line crack in head gasket. It will not register on compression test replace gaskets and have heads checked vehicle problem should be repaired
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