• Tiny
  • chayden930
  • 2003 Nissan Altima
  • 2.5L
  • 4 CYL
  • FWD
  • automatic
  • 108,000 miles

The heat is only blowing lukewarm. The radiator fluid and antifreeze is fine. The blower is working properly. The car is not overheating. During the summer months it also has seemed that the air conditioning has not been working to full capacity.

Tuesday, January 7th, 2014 AT 6:52 AM

1 Answer

  • Tiny
  • Wrenchtech
  • Expert
  • 19,832 posts

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are both hot, the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.

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Tuesday, January 7th, 2014 AT 8:37 AM

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