A flight crew reported diverting due to being unable to control the temperature in the cockpit.

Attributes
ACN	1730111
Time
Date	202002
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Aircraft Auto Temperature System
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 17 Flight Crew Total 2225 Flight Crew Type 1505
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 149 Flight Crew Total 6119 Flight Crew Type 2933
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Flight deck temperature controller was deferred. While climbing out on the departure passing 13;000 feet the flight dk temperature was indicating 83 degrees F. The temperature continued to climb. At approximately 31000 feet the temperature indicated 93 F. The captain and I conferred about the excessive heat. The captain then contacted dispatch and maintenance control as the pilot monitoring and I continued to fly the aircraft as the pilot flying. The captain and I decided that we needed to divert due to the 'extremely excessive temp on the flight deck' and that it would be 'unsafe to continue ' as the temperature continued to climb to the maximum indicated 99 F at 37000 feet. We conducted a normal uneventful diversion and landing.

Original NASA ASRS Text

Title: A Flight Crew reported diverting due to being unable to control the temperature in the cockpit.

Narrative: Flight Deck Temperature Controller was deferred. While climbing out on the departure passing 13;000 feet the FLT DK TEMP was indicating 83 Degrees F. The temperature continued to climb. At approximately 31000 feet the temperature indicated 93 F. The Captain and I conferred about the excessive heat. The Captain then contacted Dispatch and Maintenance Control as the Pilot Monitoring and I continued to fly the aircraft as the Pilot Flying. The Captain and I decided that we needed to divert due to the 'extremely Excessive Temp on the Flight Deck' and that it would be 'Unsafe to Continue ' as the temperature continued to climb to the Maximum indicated 99 F at 37000 feet. We conducted a normal uneventful diversion and landing.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.