Matt&JennyH
New member
- Jan 29, 2011
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Engine is 4.3L. Code P0128 (thermostat rationality). Replaced t-stat 2 times with dealer parts. Engine seems to run too cool...temp gauge only comes up to 1/4. No matter how long I drive, the lower radiator hose is barely warm. The upper hose is hot. Heater works great. Engine runs fine, no coolant leaks. Check engine light comes and goes, so I figure the problem is borderline. It was 70 degrees today, same problem. What next?