Question about 1999 GMC Jimmy
Start the vehicle. Check the radiator, hoses, and water pump for leaks. Look at the location of the leak. Is it under the radiator or further back under the water pump? If coolant is leaking from vent or "weep" hole on the water pump, then the pump is defective. If you can find no leaks, then it is most likely a faulty thermostat. Hope this helped and best wishes.
Posted on Aug 05, 2009
It could be coming from a few places. First to check would be your hoses ,upper and lower to the rad from the engine and your heater hoses, 2 that go to the firewall. Check your radiator for wet on the inside and outside and make sure the cap is on properly and tight. With the rad full look under the water pump, it's behind the fan and see if water is dripping out from the bottom of it. There are 3 frost plugs on each side of your engine about half way up from the oil pan that could leak. If you can't find your leak,start the engine and let it idle and warm up and check these again,it should show up as the rad builds pressure. Be very careful about driving it any distance until you get it repaired. Take water withyou and top it up as soon as it starts to overheat. I wouldn't bother with anti-freeze until you get it repaired. If you are a little bit handy with tools these are all diy repairs. Hope this helps.
Posted on Aug 05, 2009
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Posted on Jan 02, 2017
At a local parts store, purchase a coolant system pressure tester. DO NOT pressure the system while the engine is hot. The pressure tester will attach to your radiator fill cap where you can pressurize your system, exposing any leaks. Any local mechanic should perform this test free as well.
Posted on Jun 09, 2009
SOURCE: loosing antifreeze daily
Not clear...you DO or DO NOT have wet carpets? If yes, do they smell like antifreeze? Are you windows fogging up easier than normal? If so, the heater core (Heat/Defrost/AC) is bad and needs replaced.
Does it overheat? If no, then just get the radiator replaced.
Good Luck, TD
Posted on Apr 08, 2010
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