Here’s a quick way to check it. Begin with a cold engine. Remove the radiator cap and start the engine. Set your digital multimeter to DC volts at 20 volts or less. When the engine reaches operating temperature, insert the positive probe directly into the coolant. Rev the engine to 2,000 rpm and place the negative probe on the negative 44 posts · Joined 2008. #1 · Dec 22, 2008. Hey guys, my dashboard message says "check coolant level, read manual" or something to that effect. My C300 2008 had this problem about 6 months ago and the service person said it might have been a bubble. It has been cold here and I'm wondering if it has to do with the cold weather. If the coolant level is below the MIN level B , add coolant to the MAX level A . If the reservoir is empty, check the coolant level in the radiator when the engine is cold. If there is insufficient coolant in the radiator, fill the radiator with coolant up to the filler opening and also add it to the reservoir up to the MAX level. This vehicle Park your Rio on a level surface and make sure the engine is cool. 2. Locate the coolant reservoir. It’s usually a plastic tank with a transparent reservoir and a coolant level indicator. 3. Open the reservoir cap and check the coolant level. It should be between the “min” and “max” marks on the side of the reservoir. Check your coolant level periodically. Your owner's manual will have a recommended interval in which to check the coolant level. If you check your coolant level when the engine is cold, the coolant should be at or above the "minimum" or "fill" line on the transparent refill container. If you check your coolant level when the engine is hot, the The coolant-level indicator is on the side of the translucent plastic tank. Most tanks have clear minimum and maximum markings. The coolant level should be between the "min" and "max" markings. If Locate the coolant reservoir. It’s usually a plastic tank located near the radiator. 3. Remove the reservoir cap and check the coolant level. If it’s low, add coolant until it reaches the “Full” line. 4. Replace the reservoir cap and make sure it’s tight. 5. Start the engine and let it idle for a few minutes. There should be markings along the side. Check where the fluid level is compared to the markings on the reservoir. If the fluid level reaches the “full” mark, the coolant level is fine. Refill the coolant if necessary. If the fluid falls short of the “full” line, top off the coolant. DIY - How to check the coolant level on a Generation 2 Toyota Prius.You can now Buy Me a Coffee: h1RG9Fj.

how to check coolant level in car