Can I bypass my heater control valve?
Heater control valve bypass is not standard on vehicles; it is a modification. When bypass hoses are installed, the coolant in your car will always be circulating through the heater core – that means that if the core starts leaking, you won’t be able to turn it off.
What is a heater core bypass?
if you’re going to bypass the coolant that means you have to divert the heater hoses from the engine to something besides the heater core. These are the hoses that allow coolants to travel into the heater core and run out of the heater core.
Is there a way to bypass the heater core?
Disconnect the heater hoses from the firewall side. Both heater hoses will be connected to nipples, which go through the firewall and into the heater core. To bypass the coolant around the heater core, it is necessary to divert the heater hoses coming from the engine to somewhere other than the core itself.