Date: 201705
Local time of day: 1201-1800
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: B767 Undifferentiated or Other Model
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Cruise; Descent; Taxi
ATC / advisory: Ground ZZZ
Aircraft component: Aircraft Cooling System
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Not Flying; First Officer
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Person Flight Crew
When detected: In-flight; Aircraft In Service At Gate
Result: Flight Crew FLC complied w / Automation / Advisory; Flight Crew Returned To Gate; General Maintenance Action
Contributing factors: Aircraft; Weather
Primary problem: Aircraft

Narrative: There were multiple events on this flight from the beginning to the end. This report was triggered by a phone call to me from the ZZZ Chief Pilot asking for a statement on this flight because of a report from a flight attendant. Walking onto the plane before beginning any checklists; the plane was very hot. My first instinct was to complete the safety checks; and get the APU fired up right away in order to get the air conditioning up and running. These steps were accomplished promptly. After getting the air running; the plane would not cool down; and was averaging 85-87. We received multiple calls from flight attendants complaining about the heat. Each time; I assured them; that everything was being done to cool the airplane; and there wasn't anything else we could do. I even showed one of the flight attendants on the flight deck exactly how the switches were set; and that there wasn't anything else I could do.The flight crew thought that after the engines were started; it would help the airplane cool. This turned out not to be the case; and the airplane stayed above 85 with both engines and packs running. Because of previous weather; traffic at ZZZ was backed up; and we taxied for 1 hour 20 minutes in line for takeoff. The equipment cool light came on. We ran the checklist and the light went out. The equipment cool light came on again; accompanied by the sirens. We ran the checklist again; and taxied back to a gate in order for Maintenance to fix the issue. After approximately 50 minutes; Maintenance assured us we were set; and the flight was re-dispatched to ZZZZ. While working with Maintenance; they also assured the switches were set correctly to cool the airplane. Multiple people said it was the result of leaving a widebody aircraft on the ramp in the sun all day without air. The plane finally cooled to a comfortable temperature once airborne. While airborne; the Captain sent a message to Maintenance Control; advising them of what went on. Maintenance Control said that most likely; we'd get the equipment cool light again on descent.Prior to the Top of Descent; we had to run the checklist for the left bleed valve. On final descent below 18000; the equipment cool light came on again; and we ran the checklist for it (I don't remember the exact altitude). Below 2500 ft with gear down; Flaps 30; a flight attendant called to inform the pilots that they heard a metallic cracking sound from one of the middle doors. It was very bad timing for the call; and distracting during the most critical phase of the flight. On touchdown; the left reverser did not open. Write-up entered at the gate. On taxi back; we had another EICAS message with regard to the left Hydraulic System. I don't remember the specifics; but the write-up was entered; and Maintenance was briefed in person at the gate.




Synopsis: B767 First Officer reported problems cooling down an originating aircraft on the ground; a bleed valve issue at cruise; an equipment cooling light on descent; an engine reverser problem on landing; and a hydraulic system EICAS message on taxi in.