Expansion Tank Overpressure (EL)
Symptoms
Coolant pours from the expansion tank overflow after the engine is turned off. The temperature gauge reads erratically, may show L, then O, then back to L during a single drive.
Cause
Usually caused by overfilling the expansion tank (fill to the lower mark when cold, not the brim), a stuck thermostat, a faulty radiator cap (not holding pressure), or in worst cases, a cracked head allowing combustion gases into the cooling system.
Fix
First, fill the expansion tank correctly (to the lower mark when cold).
Replace the thermostat and radiator cap.
If the problem persists, test for combustion gases in the coolant using a block test kit.
A cracked head requires professional repair ($1,000-2,000).
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