Question about 2000 Jeep Grand Cherokee

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Loosing antifreeze I am loosing antifreeze with no signs of puddles or dripping. When at idle the corstarts to over heat. The auto is a 2000 jeep grand scherokee.

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First, make sure you have the proper mix of antifreeze/water (50/50)
otherwise using the a/c will cause a boil-over, even if the system is OK. Second, be sure that the electric fan comes on when the vehicle goes to operating temp (about 210degrees (f). Otherwise, system will push coolant out of the system while driving and result in overheat at idle. Fan should be on every time a/c is on as well. If temperature is normal while on the highway, then the thermostat is good. Look for debris (leaves etc) stuck between the radiator and a/c condenser. That will restrict air flow at idle and can cause problems.An internal buildup inside the radiator will do this as well. If minor, then over the counter flushes may help. Problem is that sometimes the coolant/flush mixture will go around the blockage instead of removing it. Jeep radiators are very small...any blockage makes them "marginal" at best.Last, but very important is to carefully check everything over to make sure that there are no leaks or seepage in the system. Under pressure, what appears to be nothing, can amount to a substantial loss of coolant.
This sounds long and comples, but takes longer to write or read than it usually does to make these checks. If you need help with anything you find, just ask!!

Posted on May 21, 2009

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