No Heat under the dash. Very cold here in Chicago area.

AhmedS70 · Post by **AhmedS70** » 14 Dec 2016, 15:39

Hello everyone.

I have basically no head coming underneath the dashboard in my 1999 S70. Has anyone experienced this kind of problem on there S70. Any one know what could be causing this issue.

Post by **abscate** » 14 Dec 2016, 15:56

Do you have the Electronic Climate Control (ECC) or Manual Climate Control (MCC)??

If you have AUT on your left most knob, its ECC

The troubleshooting path is different for the two systems

AhmedS70 · Post by **AhmedS70** » 15 Dec 2016, 01:04

I have the AUT on my left most side so I have the ECC. And also the two vents in the middle of the dash are blowing cold air. But the driver side left vent and the passenger side right vents are are blowing hot air although not that hot

Post by **abscate** » 15 Dec 2016, 04:23

Make sure your coolant level is topped up, first.

It sounds like you are having trouble with the damper door motor under the dash. When you first start the car, do the two LEDs on the climate control unit ( also sometimes called the ECC here, unfortunately) flash ? You need to watch them for about one minute on starting.

101 · Post by **101** » 15 Dec 2016, 05:49

What is the temperature gauge on your dash showing? Tis the season for thermostat failures.

Post by **BEJinFbk** » 15 Dec 2016, 08:20

AhmedS70 wrote:I have the AUT on my left most side so I have the ECC. And also the two vents in the middle of the dash are blowing cold air. But the driver side left vent and the passenger side right vents are are blowing hot air although not that hot

Regarding the center vents - Be sure that the roller wheel
on the left side is all the way down. That's an outdoor fresh
air vent control. You should feel about 5 detent postions in
that wheel if it's working properly.

AhmedS70 · Post by **AhmedS70** » 15 Dec 2016, 14:18

Ok the center side heat problem has been solved. Its now coming warm after I rolled the wheel all the way down. Its just that there is no heat underneath on the floor.

Post by **abscate** » 15 Dec 2016, 14:52

How about if you twist the left knob to the down arrow?

Do you hear things trying to move in the dash or is quiet?

Post by **cn90** » 15 Dec 2016, 20:06

Give this a try...

1998 V70 Defrost/Floor Heat issue:
https://www.matthewsvolvosite.com/forums ... hp?t=72567

AhmedS70 · Post by **AhmedS70** » 15 Dec 2016, 23:42

Yes when I twist the left knob to the down arrow I do hear things trying to move