Bigger is Better

I spec'ed out a new relay that better supports the switching current and voltage requirements for the heating elements with a 50% margin.  I was surprised when I received the part because it has some serious heft to it.  It has considerable weight and is about 3-4 times the size of the typical automotive relay.  Before mounting into the car, I tested turning it on and off a few times with my custom circuit.  It worked.  Now with the heating elements running, I was able to heat the fluid and actually warm up the cabin of the car.  I took it for a test drive and it worked -- it was only 10F outside and the cabin stayed warm.  One anomaly to figure out: when press down on the break pedal, the latching circuit for the heater moves to the off state and turns off the relay and heating element.  I have a suspicion that the reset chip I used to set the default state of the cross-coupled NOR circuit is tripping when I press the break pedal.  I suspect there is a voltage droop because the vacuum pump typically turns on for a second or two to regenerate the vacuum in the reservoir.  I plan to add some capacitance to the power rail of the circuit today to see if that solves the problem