Quote:
Originally Posted by jaggudada
What about the radiator? What about the poor heat transfer? or the engine is running hotter than usual because of incorrect air/fuel mix etc?
If heat produced itself is higher than component design the temperature is going to rise. Correct?
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"My Camry seems to be overheating. When I'm driving the gauge maintains and reads 6/10, when the engine is idling, it goes upto 8/10,
radiator fans kick in and then temperature goes down to 6/10 and keeps cycling over a period of 5 mins." <= Not the radiator
Poor heat transfer is seldom an issue unless you never change the coolant and corrosion has almost completely filled the water jackets. This is an abnormal situation for an average engine.
Incorrect fuel/air will not cause overheating. Your cooling system is designed to remove much more heat than that produced by your engine at highway speeds (90 mph).
Quote:
Originally Posted by jaggudada
Is it possible that when I check the block temperature may be below the t-stat setpoint and hence it is closed but as I was driving the t-stat might have opened if required?
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The above sounds like normal operation to me.
Quote:
Originally Posted by jaggudada
...once t-stat is opened, even if it is closed, you should still be able to feel the host somewhat hot. Not at 100 degrees correct? If the t-stat is closed, water pump is still running? where does it put water?
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Normally the bottom hose should be fairly hot. But that is at normal operating temperature. The thermostat has to open a few times before the engine is really hot.
The water pump moves water around internally without pumping water through the block. There is a jiggle valve on the thermostat which always perrmits minimal coolant flow through the thermostat. The purpose of this valve is to permit air to escape when filling the system with coolant.
Just test the thermostat. If you're concerned about the radiator, feel that there is heat being emitted from the entire radiator when the engine is hot, and not just the top or bottom. Also, make sure your coolant level is sufficient to fill the radiator and have a moderate amount in the overflow tank. You might also consider buying a new radiator cap.