1990 Oldsmobile Royal 88 mileage: 125,000. Unable to maintain engine temperature to 190 degree were I can maintain proper temperature for the heater and for engine. If setting idle it will go up to 210, but when you go on the road for a test the temperature drops to 140 degree's. Can you advise what is wrong? I replaced the thermostat twice with a 192-degree thermostat.
Nov 8, 2010 at 9:45 PM