Coolant has been disappearing more &more over a long time in our commuter car a 95 Saturn SL2. Mechanic said it was a radiator & overflow container leak a year ago but we see neither. We rarely see liquid pooling underneath. They replaced the thermostat & something else we can't recall & said it's not head gasket. Occasionally we smelled the coolant & saw a little on the ground under the driver seat area which a family mechanic said was the wrong location. If the air conditioner is turned on within a couple minutes warning light comes on & overflow is almost empty. If we stop & go it needs refilled quicker sometimes within 5-10 min. There is no water in the oil & no oil in the coolant overflow where we fill it. We haven't found any other access to the radiator. If driving in cooler temps for long distance on highway sometimes it goes 1.5 hrs before refill lights come on & other times much sooner. The warning lights are correct. Recently the warning lights were flashing & upon checking, the overflow was very full. We continued on & stopped to check 5 minutes later & it was empty but no sign of where it went. Its very inconsistent. Occasionally we fill it, start it, & warning lights go on right away. We check & all the water we added is gone. The mechanic wants to pressure check it again but due to its age & because its our only car at the moment we’re worried about having that done. What could it be & should we worry about having the system pressurized? Are there other tests our limited money would be better spent on?
Wednesday, August 15th, 2012 AT 12:19 AM