Why is my car still overheating after changing thermostat?
A faulty water pump could be why your car is overheating even with a new thermostat. A water pump that is not working properly can lead to overheating because the hot coolant is not being pumped out of the engine and replaced with the cooler fluid that is exiting the radiator.
What causes car to run a little hot?
Engines can overheat for many reasons. In general, it’s because something’s wrong within the cooling system and heat isn’t able to escape the engine compartment. The source of the issue could include a cooling system leak, faulty radiator fan, broken water pump, or clogged coolant hose.
Why is my coolant boiling but car not overheating?
What you are describing is usually caused by a weak radiator cap. Weak meaning it is no longer holding the pressure which is needed inside the system. Since you said you just replaced the cap, having just water in the system will lower the boiling point and may cause over pressure in the system.
How can I tell if my Subaru is overheating?
You can get another fairly definitive test response by having a hydrocarbon sensor “sniff” the bubbles emanating from the coolant (rad cap or expansion tank if visible) to show exhaust gases present in the coolant. That nails the diagnosis.
Why does my Subaru Outlander have a bad coolant leak?
If it is loosing coolant and it is not a leak, it is most likely a head gasket issue. When having a bad head gasket coolant sometimes goes from the head gasket leak directly to the combustion chamber and the problem will not put oil in the coolant and vice versa. With the poor history Subaru has with head gaskets, this is the most likely cause.
What should I do if my Subaru water pump overheats?
Also note that Subaru water pumps are also ultra-reliable, so when you replace the HGs DO of course replace the t-belt (since it comes off!), and test its tensioners, but leave the water pump alone to save a few bucks. Sounds like heresy, but remember that Subies are unlike Hondas, Toyotas and VWs that eat water pumps for lunch.
Can a bad head gasket cause a car to overheat?
If it is loosing coolant and it is not a leak, it is most likely a head gasket issue. When having a bad head gasket coolant sometimes goes from the head gasket leak directly to the combustion chamber and the problem will not put oil in the coolant and vice versa.