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Heater blows hot and then cold repeatedly

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dpayne20
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Joined: Sun Jan 13, 2019 10:12 pm
Year and Model: 2006 s60
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Heater blows hot and then cold repeatedly

Post by dpayne20 » Sun Jan 13, 2019 10:15 pm

Hello, The heater in my 2006 volvo s60 2.5t blows hot air intermittently over and over again. It will blow hot and then cold in periods of about 4 seconds. I have filled the coolant to know avail. any ideas would be helpful, thanks

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RickHaleParker
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Re: Heater blows hot and then cold repeatedly

Post by RickHaleParker » Sun Jan 13, 2019 10:35 pm

Check the damper and see if it is moving. For a 4 second change it got to be blending of hot and cold air. A heater core cannot change temperature that quickly.
Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
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1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

dpayne20
Posts: 7
Joined: Sun Jan 13, 2019 10:12 pm
Year and Model: 2006 s60
Location: Georgia
United States of America

Re: Heater blows hot and then cold repeatedly

Post by dpayne20 » Sun Jan 13, 2019 10:36 pm

How do i check the damper?

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RickHaleParker
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Re: Heater blows hot and then cold repeatedly

Post by RickHaleParker » Sun Jan 13, 2019 10:52 pm

Up under the dash, right side. Check to see if the motor(s) are moving in sync with the temperature change and listen for internal flaps flopping around.

Damper_Motor.gif
Damper_Motor.gif (80.62 KiB) Viewed 207 times
Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

dpayne20
Posts: 7
Joined: Sun Jan 13, 2019 10:12 pm
Year and Model: 2006 s60
Location: Georgia
United States of America

Re: Heater blows hot and then cold repeatedly

Post by dpayne20 » Tue Jan 15, 2019 1:52 pm

Ok I checked it, the arm moves a couple of times and then stopped, I tapped on the motor a couple times making another arm move a little and go back in place, now to passenger side still works great and the drivers side heat work up until the max heat notch and it goes back to goi g between hot and cold. Could it be the damper motor or is something in the way of the arms or is it a software issue that volvo could fix with a update?

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oragex
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Re: Heater blows hot and then cold repeatedly

Post by oragex » Tue Jan 15, 2019 3:42 pm

Maybe the climate unit needs recalibrated or the cabin temp sensor has a problem. This sensor can get damaged when the battery is connected without having the key in Pos II
2003 2.4i S60 automatic 125k miles
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RickHaleParker
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Re: Heater blows hot and then cold repeatedly

Post by RickHaleParker » Tue Jan 15, 2019 7:17 pm

Does the arm movement correlate with the changes in temperature?
Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

dpayne20
Posts: 7
Joined: Sun Jan 13, 2019 10:12 pm
Year and Model: 2006 s60
Location: Georgia
United States of America

Re: Heater blows hot and then cold repeatedly

Post by dpayne20 » Tue Jan 15, 2019 7:18 pm

Yes it does

dpayne20
Posts: 7
Joined: Sun Jan 13, 2019 10:12 pm
Year and Model: 2006 s60
Location: Georgia
United States of America

Re: Heater blows hot and then cold repeatedly

Post by dpayne20 » Tue Jan 15, 2019 7:41 pm

Everytime the tempature changes there is a buzzing sound in the dash

dpayne20
Posts: 7
Joined: Sun Jan 13, 2019 10:12 pm
Year and Model: 2006 s60
Location: Georgia
United States of America

Re: Heater blows hot and then cold repeatedly

Post by dpayne20 » Tue Jan 15, 2019 9:01 pm

Also it seems that I can recalibrate whatever is making the buzzing sound by taking both temperature dials and putting them to cold and then going back up at the same time, but when I restart the car the buzzing starts again and it gets hot and cold along with the sound

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