Q45tech wrote:I had the most severe overheat on Monday when a filler neck cap sprung a leak and pumped the coolant out [9 quarts required and I was stuck on interstate I had to drive 17 miles [in 100F] to next exit [a serious no no but I mentally prepared for $4,000 to swap engine].
A higher being was on my side since so far ok but I changed oil and ATF............................thanks Mobil 1 0w40.
All the rubber [newly changed] hoses are baked and worthless ordering every one that carries coolant for a Sat replacement.
A $5 cap cost me thousands and 3 years off my life during the incident.
Everthing bad happens on a Tuesday at least to me. Today I was reading on of your posts and it was one of the scariest things I have read in a long time:
There really is no way for ecu to know when coolant is above 235F or so since the sensor won't read STEAM!
Once the coolant gets to 194.9 F, the ecu starts removing advance 1 degree per 5F............215F is it, as far as protection is concerned. The knock sensors are rated to operate to 302F and begin to melt shortly there after.
Aluminum alloy begins to change its physical properties at 380-400F........by 500F it is significantly and permanently changed forever.
When the expansion friction increases so much that the ecu cannot maintain idle the engine shuts off, locks up, and freezes.
Then the problem gets worse when the oil if it hasn't already turned to carbon stops circulating and there is no more cooling air flow..........5-10 minutes after shut down with hood closed is probably the worst temperature.
We have seen Q drive in with 550F head temperatures all you can do is hope and use a light spray of the hose to slowly drop the temperature, use a glove to open the rad and try to add water CAREFULLY..............usually the rad is cracked and the hoses melted, water pump bearings shot, that's $1500 alone.
Then comes the real expense.
We had a customer refuse to change a leaking water pump got 15 miles and pumped out all the coolant drove back 15 miles when he noticed the overheat........by then the engine was trash!
Not uncommon when people don't understand all aluminum engines.
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I can't believe this happened to you but don't give up hope Dennis. I also hope the 3 years off your life was a joke.
Dennis does have a sense of humor for all the new people:
Q45tech wrote:Hope after all your work your 95 performs as well as a good low mile stock 90 Q.........just kidding.
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