What is the bypass pipe from the heater core to the radiator called?
Heater coolant bypass pipe
It would be the return hose for the heater.
Your 1999 buick lesabre just had the radiator replaced and then the heater core went out should they have replaced the heater core when they replaced the radiator?
i assume you mean "heater core". this is a really small radiator usually located behind the dashboard of your car. a fan blows across it when you turn the heat on. this radiator can leak eventually, just like the regular radiator is prone to doing with age. the difference is that to fix the heater core you have to tear the dash out of your car. i would just take it to a mechanic to…
You heater works from water flowing from your radiator to the heater core, you may have a leak in your heater core. You most likely also smell antifreeze inside the vehicle. It is most likely casued by a leaky heater core. Unfortunatly depending upon the make/model/year of your vehicle a heater core can be difficult and/or expensive to replace.