Any Mopar Tech's here - Grand cherokee 4.7 loosing coolant.

You can try some "steel seal" in a bottle. Drain the coolant. Remove the thermostat. Add new coolant with the "steel seal". start it and let it warm up. then put the thermostat back in and see if it does you anything, and drive very easy for the 1st 100 miles to let it work. If it works, change your coolant every 2 years and add another bottle. In fact, If you own a 4.7, you might want to put a bottle in every 3 years as a PM thing. last ditch effort before pulling out the $$$$$. And I agree with the above post.... 3.7 and 4.7 (and I'll throw in 2.7) are all bad news.