I have a 04' Ford Crown Victoria P71, I just bought it used and I wanna do some maintence on it and the coolant level is below the COLD FILL RANGE, so I'd like to know how to do it, should I add more coolant to it, meaning mixing the old and new coolant, will it be fine, or should I best drain it all then add the new coolant to it?
See, I don't even know what type of coolant is in the car, so is it dangerous to mix different types of coolant? The car manual tells me I need 50/50 coolant and distilled water, and tells me to add Motorcraft Premium Gold Engine Coolant
(yellow-colored), VC-7–A (U.S., except CA and OR), VC-7–B(CA and OR only), meeting Ford Specification
WSS-M97B51–A1.
Help, I'm lost here.