If water is low do to a leak, why doesn't the gage go up?

Asked by Jul 29, 2014 at 01:08 PM about the 2003 Chrysler PT Cruiser Base

Question type: Maintenance & Repair

Been as low as a quart of water but the temp gage never went above normal...is there a
sensor not doing or doing something to cause this?

2 Answers

19,045

A quart can go unnoticed in some cars, and some coolants expand that much between hot and cold.,, proper workings is the excess coolant keeps going back and forth to the plastic expansion bottle from hot to cool always keeping the system solid coolant with no air bubbles. the rad cap is a two way check valve if looked at closely

395

The sensor is supposed to be covered by coolant for it to actually work. Low coolant level .... and the sender doesn't actually "see" coolant on it and it might even read cooler than normal. Cool readings are even more damage-causing than hotter readings, provided coolant isn't actually blowing out the cap or reservoir. Too cool should be investigated quickly!

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