Hey, in the case for this car The Upper hose: Connected to the thermostat The Lower hose: connected to the engine / water flange The upper hose should stay cold till about 80°C - 90°C then start getting warmer The lower hose should warm as the engine / coolant temperature raises Once the system was fully bled and the thermostat had opened (which on this was about 110°c) both upper and lower hoses should be the same temperature till the thermostat closes with the fans kicking on I had used a scan tool to monitor the coolant temp senor, but you could use a infrared camera to check the hoses for temperature and flow also
@@SparKMotorWurks thanks cause I have a civic 96 and the top is very hot and bottom is slightly warm, i removed the thermostat and boiled it and it is opening, but I have cylinder head overheating and valves are rattling noise, now i removed the thermostat and temperature is equal top and bottom and rattling gone, but I see some bubbles when is running idle, and when I give throttle tends to overflow the coolant, what you advise me. Thanks again.
I'd advise to have the cooling system block tested. Get the engine up to temperature without overheating (if possible) or close to operating temperature and try it, The tester fluid should change colour blue to yellow for petrol and green for diesel gasses present in the cooling system Other things is to check that when you install the thermostat that you have it the right way up, should have a small vent hole which always goes upwards and maybe even the the coolant pump shaft, as the pump pulley may be spinning fine but the impeller may not be spinning with it
@@SparKMotorWurks thanks, the small hole is up and the water pump is new, i will put a glove for start on the radiator neck to see if it blows, and i will purchase a tester, i don't have oil mixing or white smoke, but I have a loud bass exhaust sound, thanks again
Hi what should be the temperature difference on upper and down hose
Hey, in the case for this car
The Upper hose: Connected to the thermostat
The Lower hose: connected to the engine / water flange
The upper hose should stay cold till about 80°C - 90°C then start getting warmer
The lower hose should warm as the engine / coolant temperature raises
Once the system was fully bled and the thermostat had opened (which on this was about 110°c) both upper and lower hoses should be the same temperature till the thermostat closes with the fans kicking on
I had used a scan tool to monitor the coolant temp senor, but you could use a infrared camera to check the hoses for temperature and flow also
@@SparKMotorWurks thanks cause I have a civic 96 and the top is very hot and bottom is slightly warm, i removed the thermostat and boiled it and it is opening, but I have cylinder head overheating and valves are rattling noise, now i removed the thermostat and temperature is equal top and bottom and rattling gone, but I see some bubbles when is running idle, and when I give throttle tends to overflow the coolant, what you advise me. Thanks again.
I'd advise to have the cooling system block tested. Get the engine up to temperature without overheating (if possible) or close to operating temperature and try it,
The tester fluid should change colour blue to yellow for petrol and green for diesel gasses present in the cooling system
Other things is to check that when you install the thermostat that you have it the right way up, should have a small vent hole which always goes upwards and maybe even the the coolant pump shaft, as the pump pulley may be spinning fine but the impeller may not be spinning with it
@@SparKMotorWurks thanks, the small hole is up and the water pump is new, i will put a glove for start on the radiator neck to see if it blows, and i will purchase a tester, i don't have oil mixing or white smoke, but I have a loud bass exhaust sound, thanks again