i have a 2000 4x4 4 door blazer. ive replaced upper and lower intake manifold gasket, rad cap,and thermostat. i cant seem to keep the air bubbles out of my system even after using the special funnel. as soon as i put the rad cap back on bam air right back in system. i have no leaks that i can see and im not losing any coolant. can i possibly have a bad heater core even though my passenger side floor is not wet. i swear im not an idiot and have done all work on all of my vehicles myself. im at my wits end with this thing i just want heat. any help would be greatly appreciated, thanks in advance.

 

Have you ran the engine up to temperature with the radiator cap off? You may have an airlock in your heater core so running without any pressure in the cooling system might help to clear it.


Just a suggestion but worth a try if you haven't done so already? You will find that as the coolant heats up you might find some spills out of the radiator with the cap off then all of a sudden the level will drop as any airlocks in the system clear. Revving the engine at around 2000rpm will help to clear any air as well as warm up the system quicker. Both the heater hoses should get nice & hot well before the thermostat opens.