I have bubbles in the coolant overflow tank when the car is at normal operating temp. When the engine is cold there are no bubbles, only when operating temp and especially after I drive it. I thought a...
If the car is running, you can probably rule out a head gasket. And even if it were a head gasket problem, you'd probably see the coolant level drop and have white smoke coming out of your exhaust. Have you removed the radiator cap and checked the fluid level inside the radiator? The coolant recovery tank is usually connected by a rubber tube to a vent on the side of the radiator fill mouth, and nothing flows through that tube unless the cooling system pressure increases beyond the pressure rating of the radiator cap, or radiator coolant level drops below the full level, in which case additional coolant from the recovery tank will be drawn into the radiator. This does not normally happen until the engine reaches normal operating temperature and the thermostat has opened, allowing coolant to flow through the radiator in order to keep the coolant for overheating. Again, check the radiator level. If it's OK, don't worry about it.
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