B737 Undifferentiated or Other Model
Flight Attendant Current
Physiological - Other; Fatigue
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Other / Unknown
General Maintenance Action
Aircraft
Boarded aircraft at the start of our trip. Aircraft was rather warm; I thought it's [an older B737] in the summer; it should cool down once we get going. The aircraft never cooled down; people were complaining and fanning themselves. Get to [destination] and 135 passengers boarded. We had a delay for over an hour. We did a water service. People were fanning themselves and complaining about the temperature. Captain switched from ground power to APU. It still was hot. Passengers said hot air was coming out. We continued to fly that aircraft. The entire flight we had passengers yelling and cursing at us because it was hot. I called the captain and he said he would have Maintenance come look at it. We get to [destination] and passengers were furious. We had 44 of them continuing on. Several folks talked to a CSS. Passengers deplaned as Maintenance worked on the broken air conditioning. Several of the thru passengers were upset that we were taking the same aircraft out. Maintenance said they fixed the air so we boarded. Once again the crew and passengers were all sweating bullets. The air was not fixed at all. I called the Captain again and told him it was still outrageously hot. He said we would get an aircraft swap. Flew to [destination]; still on the hot aircraft and swapped it out. Dramatic difference between the next and previous aircraft. Four legs on the hottest aircraft I ever been on. My crew and I were exhausted; not to mention sweaty. The passengers said they were writing in and were beyond upset. A few mentioned to contact OSHA. Needless to say it was an embarrassing situation. I apologized profusely.Preventative Measures: Believe the flight attendants when they say aircraft is too hot; and do something about it a lot sooner than after our fourth leg.
[Report narrative contained no additional information].
Flight attendants reported the cabin temperature in their older model B737 was uncomfortably warm.