Question about 2000 Jeep Grand Cherokee

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Loses water from resevoir but not from radiator

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  • Alan Davenport Apr 26, 2014

    Most likely it's a leak in the resivor itself

  • Joseph Hoffmann Jun 25, 2014

    I'd check the resevoir for leaks. also check the rad cap (pressure test it.).If the cap does not hold the pressure it is no good. Replace it.

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  • Jeep Master
  • 5,317 Answers

So the level keeps dropping in the reservoir? If you have to keep adding coolant to the reservoir, the system is leaking or losing coolant somewhere. Have the system pressure tested to find the leak. Is the reservoir itself leaking? When the level gets low enough, first the reservoir will go dry, then the radiator level will start to drop.
Here's how the reservoir works: coolant is under pressure from the radiator cap seal. As coolant heats up from hot engine, it expands, and pressure forces the radiator cap seal up, coolant is forced into the reservoir-remember the hot mark on the reservoir? When car is shut off, coolant contracts, creating a vacuum in top of radiator. This vacuum works to suction coolant back from reservoir into the radiator, keeping the radiator topped up, and coolant should now be at the lower cold mark on the reservoir. It is a closed, sealed system. The only loss of coolant will be a very small amount of evaporation from the reservoir. If coolant level keeps dropping, there is a leak somewhere.

Posted on Nov 22, 2013

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