Originally Posted by
LeMarky Dissod
Depends on ambient temp?
Long ago, equipped with an Meziere HD H2Opump (>48GpM if you ask Meziere), parked atop a long steep hill, I tried something stupid on a 23°F / -5°C winter's day.
I started the wagon's LT1 with the electric H2Opump disconnected.
When the dash temp gauge needle hit 230°F / 110°C, I repowered the H2Opump and rolled downhill, both fans staying on til the H2Opump temp sensor was under 203°F / 95°C.
From 23°F / -5°C to 230°F / 110°C took a wee lil bit over 7min. (Despite the stupidity, engine lasted another 125K miles, 255K miles total.)
On a record hot desert day, I'd guess 3min or less?
Important note: I'd previously familiarized myself with the correlation between the H2Opump temp sensor & the dash temp gauge needle when the engine was equipped with an OE-type mech H2Opump, a 525RpM idle, and fans set to turn on @ 235.4°F / 113.00°C?
IMEO, if the dash temp gauge needle hits 'the red', it may already be too late. Get to know your dash temp gauge needle personally before trying this stuff.