The water pump is the last thing to suspect. Chances are there's an air pocket under the thermostat that needs to be burped out. Thermostats don't open in response to hot air, just hot liquid. Look for a bleeder screw or plug near the thermostat housing. If there isn't anything, look for a sensor that can be unscrewed, then refill the coolant.
Friday, August 23rd, 2013 AT 11:16 PM