If the hoses are all tight, Then the radiator must be leaking.
REPLACE RADIATOR
The coolant leaks out.
Probably the thermostat is sticking.
You need to fix these leaks or replace the radiator unit.dordor77@netvision.net.il
Effectually, no.
Probably a radiator leak or a split radiator hose.Check coolant levels in the radiator.
No. The expansion tank will not let coolant drain into the radiator. Doing this will cause the whole system to be clogged up. WHO POSTED THIS MISSINFORMATION. OPEN A REPAIR MANUAL BEFORE YOU ANSWER QUESTIONS.
A car with a leaking radiator can be driven, but when the coolant leaks out, the engine will overheat and when the engine gets hot enough, it will seize-up, the car will stop, and the engine will have suffered severe damage.
For radiator leaks look for the following signs: The car will overheat Coolant level will frequently drop Pool of coolant or water under the car radiator Obvious leak noted from radiator on starting the car Faulty radiator cap causing the leak
Is it leaking from the side by the coolant reservoir?
There's a leak somewhere in your coolant system. Check the radiator and the hoses.
Yes, stop leak turns into a thick substance to plug any leaks, when it ends up in the overflow bottle it turns into sludge there.
Be sure the coolant reservoir is full. Be sure the hose and hose connections between the reservoir and radiator are good and tight and the radiator cap is good. Be sure that the rest of the coolant system is in good shape (no radiator leaks, no leaks anywhere) and the system will bleed itself in time.