keithj
Member
Howdy folks,
I've got an overheating problem I hope you can provide some direction on. 2003 VMax, stock engine and carbs. It's always run fairly close to the red line on the temperature gauge when running it hard. The fan turns on like it should, and has a manual switch I kick on when needed.
Coming home on a longish 5hr ride in high temperatures, the temp gauge rose into the red. I babied it home without too much trouble. Coolant fluid was low, which I replaced, but I think that was a symptom of overheating and not the cause.
This weekend I started to diagnose. The fan cycles as expected when temp nears the red line. No cold spots can be felt in the radiator coils. Coolant moves from the overflow tank as expected (pushes coolant top tank at high temp, siphons coolant as the engine cools). This makes me think that both the radiator cap valve and the water pump are moving coolant as they should. The only thing I've done is drain and flush (with vinegar) multiple times and replace the coolant. No leaks can be found.
Any thoughts on where to look for the problem?
I've got an overheating problem I hope you can provide some direction on. 2003 VMax, stock engine and carbs. It's always run fairly close to the red line on the temperature gauge when running it hard. The fan turns on like it should, and has a manual switch I kick on when needed.
Coming home on a longish 5hr ride in high temperatures, the temp gauge rose into the red. I babied it home without too much trouble. Coolant fluid was low, which I replaced, but I think that was a symptom of overheating and not the cause.
This weekend I started to diagnose. The fan cycles as expected when temp nears the red line. No cold spots can be felt in the radiator coils. Coolant moves from the overflow tank as expected (pushes coolant top tank at high temp, siphons coolant as the engine cools). This makes me think that both the radiator cap valve and the water pump are moving coolant as they should. The only thing I've done is drain and flush (with vinegar) multiple times and replace the coolant. No leaks can be found.
Any thoughts on where to look for the problem?