Heater Since I no longer have hot coolant running through a heater core, I need some way to get heat on cold days. For a while, I was undecided between a 120v fluid heater plumbed inline with a 12v pump to heat and pump coolant through the original core just like an ICE, or installing a 120v ceramic household heater in the space that used to be occupied by the original heater core. The ceramic heater is the cheapest and most common EV solution to heat. The original heater core has not been destroyed in case I decide to come back to the fluid heater idea, but for now, I am going with the 120v ceramic heater. Hope it keeps we warm on cold Indiana winter days!Wiring the ceramic heater is not very complicated. You'll need a couple of things first: a 12v off/on switch (any auto parts store) and a relay that uses 12v to switch on/off 120v. You also need to find the wire coming out of your climate controls that completes your blower motor circuit. In my zx2, the blower motor is powered any time the ignition is in the "run" position, but only gets grounded when the ac/heater selector is in any position other than "off" (like panel, floor,defrost, etc). My fan speed selector allows you to go from lo-hi, but it's always on when the ac/heater selector is on. I tapped the power from the power window hot wire which is only hot when the ignition is in "run". Then I tapped the ground ac/heater selector switch output. Which means my 12v switch can only be turned on when the blower is on. This means my heater can never be on unless the blower motor is on AND the heater switch is turned on. It's a nice simple safety measure to keep the ceramic heater from being on when it shouldn't be and possibly overheating something inside the dash. Also, I chose an illuminated 12v switch and mounted it high on the dash to serve as a visual reminder that I have the heater on. The hot wire coming from the 12v switch goes to the low voltage " " on the relay. The relay's low voltage "-" is grounded to the chassis. Next, the " " from the ceramic heater will go to the relay's high voltage "-", then another fused wire will run from the relay's high voltage " " to the traction pack most " ". The ceramic heater "-" will go directly to the traction pack most "-".