We had a car dropped off last week with a coolant leak on the inside of the passenger footwell. Typically when we see coolant leaking into this area, it’s coming from the heater core. Sure enough, that’s what happened in this case, so we replaced the heating core.
That prompted me to write this month’s column on the heater system (I discussed air conditioning last month), even though fall hasn’t arrived just yet. The heater system isn’t as complicated as the air-conditioning system, but they share some common components.