heater blows hot and cold

2005 VOLVO S80
130,000 MILES • 2.4L • 5 CYL • 2WD • AUTOMATIC
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PETE 56
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  • 1 POST
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.
Jan 19, 2018 at 3:54 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
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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Professional Diagram for 2CarPros Members
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Jan 20, 2018 at 1:06 PM
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Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.