Bizarre that the level is going right down when hot. Does the radiator need to be … read more The coolant level should be at the tank's MAX or HOT line when the engine is hot, and lower when it's cold. The coolant is meant to absorb high temperatures from the engine and as such your radiator is going to be under pressure and the fluid inside will be extremely hot. May have dropped 1/2inch over the last 3 months when the engine is hot. I would have the oil checked for any coolant contamination, it might not hurt to replace the radiator cap if it’s not holding pressure. Another symptom of a problem with the coolant temperature sensor is an overheating engine. Never refill your coolant when your engine is hot. The coolant level drops when the engine get hot (coolant level low warning comes on), it seems to fluctuate and the warning light goes on/off during a trip. 3.2. I would have suggested using a Block Test to check it (with blue fluid turning to yellow indicating gas in coolant) but as the first post says, this has been checked already. How to Check Engine Coolant Level. If you were to open the cap when the engine is still hot, you're going to suffer some serious burns as a result. I assume you are referring only to the Low-Coolant warning light and not the coolant reservoir under the hood. Coolant level is at Max. Yes. Engine overheats occassionally and heater takes time to supply hot air, and gives cold air when car is overheating. Ed B. Always check coolant levels in a cold engine. Always wait for it to cool down. It has been almost 3 months since my last oil change so time for another change and the coolant level still seems almost at the mark I placed. If you open a radiator cap when the engine is still hot, you could be burnt by escaping steam or hot coolant. But when the engine has a chance to warm up and run for awhile the coolant level goes right back to the mark. Finally, the coolant level on my 2006 Sienna, 1993 Caprice, and 1995 Dakota does not drop between changes (~3 years). The coolant temperature sensor can also fail in a manner that causes it to send a permanently hot … High engine compartment temps. Engine coolant is vital to your vehicle's function. Draining out the coolant and refilling the system removes dirt and rust particles that can clog up the cooling system and cause problems in winter and summer. Honda Civic 2003, 112k miles. Hot coolant expands into the overflow reservoir, and some vapor may escape. Not only does it keep your engine cool and protect it from overheating, which can cause a number of detrimental and costly problems, but also allows your engine to function at its optimal level. 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