You have a leak in the cooling system. If you don't see evidence of coolant leaking on the ground, you probably have a head gasket problem. Have the system pressure tested soon before more serious damage is done.
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how to add coolant to 1991 lumina?
The overflow resavour is where you add coolant
You add coolant to a C240 at the radiator overflow tank. This allows the radiator to suck in coolant as needed when hot.
no cap, just the coolant tank, add to this to add coolant../
You should not mix colors or brands of coolant.
it is updated every month
The coolant add/overfill jug is on the left side of the motor when your looking at it. Add coolant up the closest line towards the top, and only when the engine is cold.
Add coolant to the full cold line on the coolant reservoir when engine is cold.
You have a coolant leak somewhere. Fill and check underneath for any obvious leakage.
I would say no , on my 1995 Ford Explorer XLT - I probably add a little coolant to the tank each year when it starts to get colder outside
Radiator. Remove the cap and add coolant there.