Needs a new thermostat
if it was cold then ur engine wasnt warmed up that is one reason. or it was to hot out and ur radiator isn't working properly and it overheate. did it start after a while??
Try draining the oil after the engine has warmed up first.
Mine is between 500 and 600 rpm's after the engine is warmed up.
A vehicles water pump circulates coolant ( water and antifreeze ) through the engine and to the heater core and the radiator. The coolant is warmed up in the engine and the coolant carries the heat to the radiator where it cooled down before being recirculated through the engine again.
check to make sure there is coolant in the radiator. if not, fill it, and bleed the air from the system by leaving the radiator cap off until it has warmed until normal operating temperature. Keep topping off the radiator, then cap when it stays full.
Typically this is caused by either an engine thermostat that is stuck closed or a radiator that is bad and needs re-cored. With the engine running and radiator cap off and engine warmed up to normal operating temperature or above, look in the radiator for coolant movement. If you see it flowing, have the radiator repaired or replaced. It,s important to remove the cap prior to warming it up to prevent injury from hot coolant under pressure.
If your car has an automatic transmission, there will be a short dipstick near the front (radiator side) of the transmission. With the transmission warmed up (go for a short drive), park on a level surface, and with the transmission in park or neutral and engine running, pull the dipstick out and check the fluid level against the markings on the dipstick.
Cars run better when the engine is warm. Thermostats stays closed to prevent the water from going through the radiator to be cooled until the engine has warmed to the desired temperature. Then, it opens to allow the water to be cooled to prevent the engine from getting too hot.
Defective radiator cap? Leak in system (Pressure test)? Head gasket?
You need to fix these leaks or replace the radiator unit.dordor77@netvision.net.il
Top up the radiator then run the engine until warmed up to normal operating temperature; shut it off and let it cool down half an hour.Top off the radiator again. You are done.
Assuming the engine is not overheating, it is normal for the hoses to get hard. The pressure in the cooling system should reach the maximum of whatever the radiator cap is set for, usually 15 to 17 lbs.