Question about 1997 Jeep Grand Cherokee

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Coolant Leak issues

Mech. replaced radiator, and the lower hose (new clamps too)...and the onboard computer still lets me know that there's a coolant level low. My mechanic replaced the cap with an 18 PSI, he's 'blown' the lines and can't find where this thing is leaking from. Any idea's?

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  • 6,982 Answers

First question is., Is the coolant actually low or is the computer just telling you that? Next, if it's full, remove the cap and run it for about ten or fifteen minutes with the heater on high. This will remove any air from the system. If coolant actually is leaking, the water pump is the first suspect. If the mechanic is pressure testing system, pressure will actually drive the pump seal against the shaft and prevent it from leaking. To check correctly, remove the cap and leave system open, then look or feel under the pump to see if anything is dripping or running out from the "weep hole" If radiator was changed after an overheat, then spark plugs and exhaust should be checked for coolant. (possible blown head gasket or crack in cyl head. This condition usually also comes with rougher than normal running, so at this point I would not get worried yet.
good luck

Posted on Jan 28, 2009

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