1998 GMC Jimmy heater core & blend door replacement Part 1

[@josuepedraza3754]

Will a bad heater core smoke into the cabin? Thanks for the video

[@WindyridgeProjects]

Signs of leaking heater core you get oily residue on your windows and keep fogging up especially when it's colder temps out side . Next is you can smell it and even taste it from the mist going through the ductwork and if hole is big enough it will leave puddle on floor or wet mats. My heater core split along the top seam just enough to fog up all the windows and stink with the hot coolant . Hope this helps you there are 2 parts to the video and thanks for watching