Low coolant light

[DrRadar]

I have been having trouble with the low coolant idiot light on my 99 GTP for many months. Actual coolant level has never been a problem. At first it was intermittent then constant on. I removed and cleaned the sensor which resumed intermittent behavior for a while but returned to constant on. I concluded the sensor was bad and today replaced it. The idiot light remains on constantly.

I have read archived postings, particularly pinkcookies26 9/15/2009 (almost made this posting a reply to that one), gtpguy 5/12/2004, and helicopter23 6/25/2009. Apparently this sensor is a chronic problem and it may not be worth spending more time on.

I flushed and filled last year with Prestone DexCool. The archives imply that Prestone DexCool can cause the sensor to trigger. Could this be my problem?

[tblake]

yes, you hit the nail on the head. GM sensors seem to have an issue with prestone dex-cool.

I too had that issue immediatly after a coolant flush. Replaced sensor, ok for a short time, back on again. Then one day driving it shut off and has been fine since....?

If your ok with it, you could just un plug the sensor.

[BNaylor]

Originally Posted by DrRadar

I flushed and filled last year with Prestone DexCool. The archives imply that Prestone DexCool can cause the sensor to trigger. Could this be my problem?

Last time I checked the credible archives were referring to primarily Prestone Extended Life 5/150K coolant and not Prestone's licensed version of GM's Dex-cool but I guess it is possible to have the same issue.