YOU add coolant to the overflow catch tank not directly to the rad,when motor is cold remove catch tank cap,if you can barely touch the fluid with your longest finger then you are ok.do not fill to the top,as is fluid will just overflow on to the ground
The coolant level in a Northstar is checked by taking the top off the surge tank when the engine is cold. The coolant should be about 1 to 2 inches down. If you can dip a finger in and get it wet, you're fine.
The easiest way to drain the coolant on a Northstar is to pull the lower radiator hose off. There is a petcock on the lower left (driver side) of the radiator but it's almost impossible to get to without a special tool.
It is on the drivers side of the rear cylinder head.
DO NOT FLUSH the coolant system on a northstar. Drain the coolant, replace with 50/50 Dexcool and fresh clean water, and you're good to go. Especially NEVER NEVER buy a "Coolant Flush" at a dealer or quicky-lube place. All you'll get is the previous sucker's engine gunk pumped in to your engine.
The Northstar engines hold approximately 12 1/2 quarts of coolant, or a little over three gallons.
To bleed the air out of a Cadillac Northstar cooling system, start by ensuring the engine is cool. Remove the radiator cap and fill the cooling system with the appropriate coolant, then start the engine and let it idle with the heater set to maximum. As the engine warms up, keep an eye on the coolant level and add more if needed. You may also need to open the bleeder valve located on the engine block to release trapped air until coolant flows steadily from it.
check your coolant in your radiator northstar engines are designed to have your fans running if you have low coolant.
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.
Coolant in a Northstar V8 engine should typically be flushed every 30,000 miles or every two years, whichever comes first. However, it's also important to check the owner's manual for specific recommendations, as factors like driving conditions and coolant type can influence the interval. Regularly inspecting the coolant for signs of contamination or deterioration can help determine if a flush is needed sooner. If the engine exhibits overheating or unusual temperature fluctuations, a coolant flush may be warranted regardless of mileage.
For a 1995 Cadillac Eldorado with a V8 Northstar engine, it's essential to use a high-quality coolant that meets the specifications for GM vehicles. A good choice is a 50/50 mixture of ethylene glycol-based coolant and distilled water, or you can use a pre-mixed coolant designed for GM cars, often labeled as Dex-Cool. Ensure that the coolant is compatible with aluminum engines, as the Northstar has aluminum components. Always check the owner's manual for any specific recommendations.