Have a '97 Pontiac Bonneville SSEi, 142,000 miles. At speeds above 50 mph, the engine temp. Indicates 215- 218 deg, seems the car use to hold it's design 195-200 deg, at nearly any speed, at any ambient temp. I've pulled the radiator, had it rodded out, & exterior cleaned, new thermostat, cap, cleaned the A/C coils in front of Radiator. Should the Dash gauge be suspect, in this car? Will a partially plugged Catalytic Converter contribute to this? The EGR valve failed, a few days ago, replaced it, but saw no change, (except, it cleared the computer code, & most importantly, it idled & started). Any way to test the Dash Gauge? Dont see any leaks, on 3 yr. Old water pump. Am suspect of a tiny leak, perhaps on the Intake, as has been the case, on many of these cars. But coolant loss is perhaps less than 6 oz. Per month. Any suggestions appreciated.
Saturday, May 13th, 2006 AT 9:07 AM