IF HE JUMPERS THE RELAY IT WILL OVER COOL THE ENGINE. The fuel maps in his ECU will cause timing to retard like crazy if the engine is running too cool. AFAIK, on a 1g (I know you're 2g) the timing will retard almost ten degrees if coolant temp is significantly too low.
you'll lose some hp for a while, but you wont hurt anything... you CAN jumper it until you can find the REAL solution.
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-Shawn
(2 posts my a$$, I posted plenty in the autox section 3-4 years ago... GOD, i go on deployment ONE time and you reset my counter? lol)