ACDelco GM Original Equipment 10-108 Cooling System Sealing 🔧 Tabs - 4g (Pack of 5): Optimal Cooling System Maintenance Solution Review

This product was used on a motorcycle and a vintage Ford van with a leaking head gasket. Worked both times. Driven 90,000 km with the van without any problems. Saved him from going to the landfill. I like to try it before chemical sealers because it's less abrasive - it's literally made of spices. I don't know how well it will work on a big leak, but if it's a small one it seems to fix it right away.

This is an OEM coolant sealant from GM. It's designed to take care of any GM coolant leak. On some models, it had to be used with every flush and coolant refill. I don't use directions. I usually use the entire package on every machine I work on. Never had a problem. Works as it should. I would try them on a GM car first before using more common sealants. This one won't clog anything you need.

This is what GM uses in new cars. They do an excellent job on hard-to-find leaks. They obviously won't fix a water pump or head gasket problem, but as intended, they will fix small leaks and won't destroy or clog the cooling system like most parts store crap. If you ever want to use a stopper, this is the only one worth using. It also leaves no trace of ever having been installed. It works on anything with a cooling system, from ATVs to semi-trailers and everything in between. This is the only…

There were known sealing symptoms or head cracks. My 2004 Chevy Avalanche drank about 1 gallon a month. I thought why not try this product. I mixed 3 tablets with water and poured into the upper radiator pipe. And mixed 2 tablets poured into the expansion tank. Drove to work, checked level after cooling, coolant was where it should be. Also, the oil pressure is back to normal and the truck sounds great. The next day we decided to drive to San Francisco from Ontario, California. Let me just say…

I purchased this product because my 2004 Cadillac DeVille had three coolant leaks; Radiator, coolant overflow pipe and cylinder head gasket. Fixing all of these leaks would be extremely expensive, especially replacing the head gasket. The workshop told me about these coolant sealing tablets, so I thought it wouldn't hurt to try. The store changed the coolant and added four of these tablets to the cooling system. That was a week ago and the coolant level in the expansion tank hadn't dropped at…