AMM:
Purpose
The overheat and fire detector senses high temperatures in the engine compartment -
Location Three sections of the detector are mounted around the fan case (the accessory compartment) and one section is mounted on the high pressure turbine case (core compartment).
Never did i say any temp sensors were INSIDE the core.
Considering not idling the engine as DIRECTED by the QRH is a poor advice and reminds me of this note in the QRH:
It should be noted that, in determining the safest course of action, troubleshooting, i.e., taking steps beyond published non-normal checklist steps, may cause further loss of system function or system failure. Troubleshooting should only be considered when completion of the published non-normal checklist results in an unacceptable situation.
QRH actions for overheat:
1 Autothrottle(ifengaged)...........Disengage
2 Thrustlever
(affected engine) . . . . . . Confirm . . . . . . . Close
3 If the ENG OVERHEAT light stays illuminated:
►►Go to the ENGINE FIRE or Engine Severe Damage or Separation checklist
Is a false statement, if I understand it the way it comes over. I.e. "reducing the thrust causes the core temperature to decrease and hence the overheat condition may disappear". Again, the temperature inside the core, is not being monitored by the overheat/fire detector loops. It might be a good idea to idle the engine for other reasons (like a bleed leak).
I told the OP that idling was a good idea,ie a better idea than running the engine at high thrust because he believed his normal engine parameters (EGT)was normal therefore an overheat was disregarded.
Just because the loops are located near, but outside, the core, doesn't mean that anything going on in the core is being monitored.
In the engine core there is both heat and fire, and you don't really want to put either out, unless parked at the gate.
True,but the sensors are strategically place around the core as it is considered a fire hazard area,to monitor heat/fire temp due to leaks.