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I have a 05 mach with updates latley when i get up to 115 or so after a good 1/2 hr or so of warming up the templight will flash 10 times and beep. When this happened last It was 25to28 deg F with plenty of snow on the lake and the temp gauge was reading 1/8 to1/4 temp no big deal running 93 oct for gas. Its bone stock except for decomp pluges removed and the slugs put in at time of the update by dealer.Even my dealer isnt sure why. Any help would be great. thanx
 

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On the 06 Mach z there is a cooling update. It has to do with a leaking gasket. I'm not sure if any of the 05's have this problem or not. If you have leak the water pump can suck air through the leak at hight speed and cause the temp light to flash...
 
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