Heater blows hot and cold

Tiny
PETE 56
  • MEMBER
  • 2005 VOLVO S80
  • 2.4L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
The heater blows hot and cold. New water pump correct coolant. Set temperature at high they blow hot then blow cold for twenty seconds then back hot.
Friday, January 19th, 2018 AT 3:54 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,968 POSTS
It sounds like you have a temperature blend door actuator that needs replacing. Here is a guide to show you what you are in for when doing the job:

https://www.2carpros.com/articles/replace-blend-door-motor

Below are all of the blend door actuators just in case you want to see how the system works.

Check out the diagrams (below).

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Saturday, January 20th, 2018 AT 1:06 PM

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