Here are some things about your Cadillac and what you should do to prevent Overheating and solve diagnose, repair, prevent your 1998 Cadillac Northstar GM engine GMC from overheating or leaking. Don’t wait for your check engine light to come on, or when your luxury sedan gets hot. If you don’t have extended car warranty, car maintenance insurance, you’ll have to do the maintenance yourself. Some of them are basic, but some of them your mechanic won’t tell you. Also, check out the new type of thermostat for your engine that prevents it from overheating when your thermostat fails used auto parts, salvage yards, Pick-n-Pull, U Pull It, eBay. These types of thermostats can be put on any car DeVille, D’Elegance, Escalade, luxury sedan. See the YouTube below” tutorial” and it will explain more how it works. Watch this video a few times to develop your confidence DIY. Please note, this is not an ad for Dex-Cool. Do your due diligence on using Dex-Cool. There are those that say, “Never ever use the GM recommended Dex-Cool and the tablets.” Others will say they have been using it for years with no problem. Dex- Cool says they have reformulated their product. Others say don’t use Stop Leak, but the recommended Dex- Cool tablets are made with the same stuff. Cooling System Sealing Tablets Seal Tabs should not be used as a regular maintenance item after servicing an engine cooling system.Discoloration of coolant can occur if too many seal tabs have been inserted into the cooling system Napa, Advance Auto Parts, AutoZone, O’Reilly’s. This can occur if seal tabs are repeatedly used over the service life of a vehicle. Where appropriate, seal tabs may be used if diagnostics fail to repair a small leak in the cooling system. When a condition appears in which seal tabs may be recommended, a specific bulletin will be released describing their proper usage. You do your research and you decide what you want to use.

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