I bought this car second hand and they were troubleshooting an overheating problem. They had already replaced the radiator, thermostat, pressure cap and starter. They claimed the water pump needed replacing. I have since replaced the water pump and headgaskets along with taking the heads to the machine shop and having then tested and machined in hopes of solving this problem. Yet even after all this it can only drive 5-10 minutes before boiling the 1/2 & 1/2 coolant inside the overfow. A mechanic noticed that the cap and right side of the radiator are cool and the left and hose are hot and tight with pressurized fluid. After overheating, it can take up to 20 minutes for the coolant to flow naturally back through the radiator. I have had it flow checked and pressure tested. Finally, I took the thermostat out completely and the gauge continues to rise and fall at it's own pace and seems to be unaffected by turning the heat on or off. Also without change in driving or traffic it seems to reach the red and fall back with a mind of it's own, yet I know when it will overheat by the temperature of the heat in the car, the inside heater throws cold air just before overheating again. The fan seems fine but may be turning on late. What else can be done? After reading many forum Q&A I am wondering what to do next. Another pressure cap? A freeze plug? A temperature sensor? A radiator chemical flush? Intake manifold gasket? Another pressure test for a leak that has not been found? I really want to drive this car with a thremostat before winter. HELP
have the same problem?
Monday, September 3rd, 2007 AT 1:05 PM