If it were me, I'd find the wire going to the PCM from the coolant sensor, and see exactly what it's seeing, in terms of voltage. A disconnected coolant sensor usually shows very low temp, like -40 degrees in the case of my 4.6L. The super-high temp means it's either shorted directly to ground(+12?) or the PCM input circuitry is bad.
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- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
You can subscribe to motorcraftservice.com and get all the wiring diagrams. It's something like $11 for 72 hours, $20 for a month, etc.
You can print them out, or save the images to your local computer.
__________________
- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
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