Join Date: Mar 2002
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venting the coolant system
I need to replace my thermostat (stuck open). I've got a 258 (4.0 head - not that it really matters), so the thermostat is on the top front of the head. I also have a heated intake. The connection pattern for the heater loop is:
pump to heater core (upper)
heater core (lower) to intake (rear)
intake (front) to thermostat housing
I don't know if the hoses for a v-belt system are significantly different, but the high point in mine (serpentine) is right in the middle of the upper radiator hose. What is the best way to refill the system, purging/venting as much air as possible? Does getting as much air out as you can really matter - in other words, does the system do a good job of venting itself? If it does, how does it push the air out and pull water in? I realize the overflow tank is there for expansion/contraction, but I don't get how it would help get air out (if it does).
Also wondering which way the coolant flows... does the pump push water into the engine or pull it out?