Narrative:

Upon acceptance of the dispatch release we noticed there was a [maintenance release] defect report stating that the cabin temperature was too warm; and that the crew was unable to control the temperature through normal procedures. The discrepancy report did not indicate whether the aircraft was on the ground; or airborne at the time of the malfunction. The corrective action indicated the fault was corrected and that all temperature perimeters were within the normal range; and that the aircraft was returned to service.with this particular [maintenance release] defect reported the day before; as well as the high surface temperatures; I elected to start both engines and assess cabin temperature from air supplied to the packs directly from the engine-bleeds prior to departure. Since the temperature of the conditioned air as supplied from the APU bleed; as well as the engine bleeds was satisfactory to the entire crew on the ground; we departed on time.at approximately 10;000 feet MSL; we noticed the temperature of the air leaving the vents on the flight-deck becoming uncomfortably warm. Soon afterward the [lead flight attendant] called and stated same problem was occurring in the cabin.as we were unable to control the temperature normally; I directed the execution of the non-normal checklist for cabin temperature hot. If the cabin temperature cannot be controlled with the non-normal checklist; the procedure eventually requires descent to 10;000 feet MSL or below and opening the outflow-valve to allow better ventilation. It also requires an immediate landing at the nearest suitable airport.as we were complying with the non-normal checklist; I immediately [advised ATC] in accordance with fom (flight operations manual) 2.10.1 as well as the fact that we would perform an overweight landing. I completed the test briefing with the [lead flight attendant] and the cabin was not prepared for evacuation. We informed the company of our plan to air-return and the passengers were briefed on the situation.we landed at [the departure airport] without incident and taxied to the gate without further assistance. Although temperature within the aircraft was uncomfortably warm; at no time did any crew member; and/or passenger ask for or require medical assistance.we debriefed maintenance personnel in great detail about the malfunction. I also conducted a de-brief in accordance with 'the debrief' checklist card and fom 3.70 with my first officer. Additionally; I called and debriefed the [chief pilot].I would like to take this opportunity to recognize my first officer and my [lead flight attendant] for their professionalism and proficiency during this event. In addition; TRACON; as well as arff were outstanding.after a period of 20-minutes after my initial de-brief with the [chief pilot]; I called the [chief pilot] back and informed him that we were fit for duty and elected to continue the flight with another aircraft. We eventually completed the mission and safely delivered our passengers to [their destination].

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Original NASA ASRS Text

Title: B737NG Captain reported that the temperature in the cabin and cockpit was uncontrollable and it became too hot.

Narrative: Upon acceptance of the Dispatch Release we noticed there was a [Maintenance Release] Defect Report stating that the cabin temperature was too warm; and that the crew was unable to control the temperature through normal procedures. The discrepancy report did not indicate whether the aircraft was on the ground; or airborne at the time of the malfunction. The corrective action indicated the fault was corrected and that all temperature perimeters were within the normal range; and that the aircraft was returned to service.With this particular [Maintenance Release] Defect reported the day before; as well as the high surface temperatures; I elected to start both engines and assess cabin temperature from air supplied to the PACKS directly from the engine-bleeds prior to departure. Since the temperature of the conditioned air as supplied from the APU Bleed; as well as the Engine Bleeds was satisfactory to the entire crew on the ground; we departed on time.At approximately 10;000 feet MSL; we noticed the temperature of the air leaving the vents on the flight-deck becoming uncomfortably warm. Soon afterward the [Lead Flight Attendant] called and stated same problem was occurring in the cabin.As we were unable to control the temperature normally; I directed the execution of the non-normal checklist for Cabin Temperature Hot. If the Cabin Temperature cannot be controlled with the non-normal checklist; the procedure eventually requires descent to 10;000 feet MSL or below and opening the outflow-valve to allow better ventilation. It also requires an immediate landing at the nearest suitable airport.As we were complying with the non-normal checklist; I immediately [advised ATC] in accordance with FOM (Flight Operations Manual) 2.10.1 as well as the fact that we would perform an overweight landing. I completed the TEST briefing with the [Lead Flight Attendant] and the cabin was not prepared for evacuation. We informed the company of our plan to air-return and the passengers were briefed on the situation.We landed at [the departure airport] without incident and taxied to the gate without further assistance. Although temperature within the aircraft was uncomfortably warm; at no time did any crew member; and/or passenger ask for or require medical assistance.We debriefed maintenance personnel in great detail about the malfunction. I also conducted a de-brief in accordance with 'The Debrief' checklist card and FOM 3.70 with my First Officer. Additionally; I called and debriefed the [Chief Pilot].I would like to take this opportunity to recognize my First Officer and my [Lead Flight Attendant] for their professionalism and proficiency during this event. In addition; TRACON; as well as ARFF were outstanding.After a period of 20-minutes after my initial de-brief with the [Chief Pilot]; I called the [Chief Pilot] back and informed him that we were Fit For Duty and elected to continue the flight with another aircraft. We eventually completed the mission and safely delivered our passengers to [their destination].

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.