Posted by dhermesc on April 25, 2018 at 15:09:14 from (24.248.193.103):
I just bought a 2002 Chevy 1500 with a 5.3 engine (about 95K on the clock). The previous owner said that the "low coolant" light had been on the entire time they owned the vehicle(2 years) - but the coolant wasn't low. The day before I test drove the vehicle the expansion tank (reserve tank) had been replaced - he said they couldn't replace just the sensor - it was part of the tank. I test drove and bought the truck. About an hour of driving it the "low coolant light" came on. Parked and checked and it was below the half mark (full when cold line) about an inch or two. Very carefully removed the cap and the expansion tank backfilled to the "full" line when the pressure was relieved. I went ahead poured a little less than a quart of coolant into the expansion tank (overfilling it some) and drove it 6 more hours without issue.
Most people say the tank gets fuller under pressure - this one appeared to lower the coolant level an inch or so. It was as if the hot air pushed the coolant out into the rubber hoses and engine. Would soft (original?) water hoses account for this?
I did some more checking and everyone appears to agree a loss of coolant indicates a failing water pump - even if there is no visible leak.
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