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Heat not blowing out of vents, only"warm"not hot

Tiny
KERRYLEE1
  • MEMBER
  • 2000 BUICK LESABRE
  • 14,000 MILES
I added 50/50 coolant to the dexcool that was already in the tank.I was low. After adding I have noticed the heat is now "warm" at best when the temp is pushed all the way to the red and fan is moved to high position but not blowing through vents, just trickling through.I can hear the fan on. What could be the problem.I was told it is ok to add 50/50 to dexcool now.
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Monday, October 31st, 2011 AT 5:52 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
It could be a couple things. With the engine hot and running and the heater on high, feel both heater core hoses. Both should be hot. If only on is hot and the other warm, flush the heater core. If both are hot, check the blend air door. It is located by the heater core and determines how much heat enters the vehicle.
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Monday, March 22nd, 2021 AT 12:55 PM

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