Cooling issue, 2.7L, AT, AC, 4WD
Truck is consuming coolant, about 1/2 gallon every 300 miles.
No obvious leaks, have pressure tested numerous times at 13 to 15psi, holds a steady pressure and again, no visual leaks or drips.
No codes, runs fine.
I have replaced the thermostat and water pump with new, not rebuilts.
Doesnt seem to cycle coolant through the pump at operating temps, bottom radiator hose is considerably cooler than the top hose, which is hot but not overly hot to touch.
I really dont think this is cycling at all?
Head gasket leak at a cylinder and dumping into cylinder?
one would think it would smoke like a train, miss and foul plug and a CEL maybe?
How to proceed?
When coolant is low, allows no flow into heater core and will blow cool air.
Saturday, October 27th, 2012 AT 9:27 PM