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when changing out a heater core do you have to prime the new one?
Or will the pressure fill it up. I added more fluid to the radiator, but didn't think I needed too fill the new core.
It was suggested I add the make year and model. 1989 GMC Vandura 2500 Van
3 Answers
- Anonymous9 years agoFavorite Answer
Short answer: No. Just overfill the reservoir initially, then top it off after driving it for a while and then giving it a chance to cool down. Long answer: The water pump circulates the coolant throughout the cooling system. Thus, coolant is forced through the heater core, but with one limitation; ONLY when you have the heat set to hot. This temperature selector for your climate control opens and shuts a valve that allows or blocks flow of coolant through the heater core. Hot coolant flows through the heater core, a fan blows air through the heater core and you get hot air inside the passenger compartment.
- Steven PLv 69 years ago
no but you should have said what type of car because many have bleeders to open to prevent vapor lock and overheating
