I have a Chevrolet s10 with a 4.3l v6 which just hit 200000 km . I got my mechanic to replace the intake manifold gasket two months ago after a huge coolant leak. It ran fine since then, however lately I noticed this little puddle of coolant building up from time to time. It is not every time I drive the truck, it shows up at random times. The puddle is pretty insignificant. I just want to make sure if it is something I should be concerned about?. My coolant level in the coolant tank is above the full mark. I also replaced the upper radiator hose 3 weeks ago.
Over the last two days , i tried to recreate scenario when the leak seems to happen. I noticed that the leak only happens when i start the vehicle in the morning or after the engine's cooled off completely. The leak seems to happen from the bottom of the upper hose. Does this mean i need to change the thermostat and the connector to the hose?
There is absolutely no leak when i drive the truck. There is no loss of power either. Truck doesn't seem to overheat and there is more than enough coolant in the reserve tank.
I've driven with the AC and the heater on full blast. Other than the expected power loss from the AC, i don't feel any drastic change in the pulling capability.