White substance in radiator coolant

[Guv Bob]

I had a leak in a radiator hose over night and ended up with a puddle in the driveway. After the liquid evaporated it left a heavy white stain. It also left white stains everywhere it had dripped on the hoses, etc. The coolant itself is the normal greenish color and nothing else has been added.

I've never seen this before and the local radiator shop didn't know either. Any ideas what the white material might be?

The coolant temp is fine unless I sit idling for 2-3 minutes in gear - then is would climb to full scale if I don't rev the engine.

Have changed thermostat, temp sensors and fan clutch within the last few months.

Thanks in advance.

[Geoff Welsh]

Post by Guv Bob
I had a leak in a radiator hose over night and ended up with a puddle
in the driveway. After the liquid evaporated it left a heavy white
stain. It also left white stains everywhere it had dripped on the
hoses, etc. The coolant itself is the normal greenish color and
nothing else has been added.
I've never seen this before and the local radiator shop didn't know
either. Any ideas what the white material might be?
The coolant temp is fine unless I sit idling for 2-3 minutes in gear
- then is would climb to full scale if I don't rev the engine.

This is totally normal. Whenever I am in city stop-and-go traffic I
notice everybody with a GM madly revving their engines over and over again.

GW