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Air through vents not very strong

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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1997 - 2000 V70, V70 AWD
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5rivers
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5rivers

Air through vents not very strong

Post by 5rivers » Thu Aug 09, 2018 8:23 am

Greetings!
We had quite the thunderstorm and downpour yesterday and in the process of driving home through this, I attempted to eliminate the fog on the inside of the windshield. When I use the AUT selection, there is plenty of air and coming out the vents very strong, but not much air on the windshield. When I move the vent position dial to defrost the windshield, and temp to 64, 68 or 70 F, even on the highest fan setting, hardly no air is coming out on the passenger side of the windshield, and just a tad more on the driver's side. I was tempted to wipe the inside of the windshield so I could see the road, but there was enough of a clear section to see just above the wiper! So, my question is: what am I facing here? A weak blower motor, plugged up air vents, or other parts gone bad? Where do I start in order to have blower throw air with intent? Appreciate your thoughts and suggestions!

scot850
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scot850

Re: Air through vents not very strong

Post by scot850 » Thu Aug 09, 2018 10:52 am

Do you have MCC or ECC heater controls. MCC uses cables to operate the vents and ECC uses servo motors. Either way it could be a bad flap not diverting air to the windshield. To do that the most, first check if you get better flow to the windshield when set to defrost setting, not AUT.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

5rivers
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5rivers

Re: Air through vents not very strong

Post by 5rivers » Thu Aug 09, 2018 11:34 am

I am not sure if the car has MCC or ECC heater controls, but I do know that when the defrost setting is selected and the fan is on high, there is air coming through the vents to the windshield. It is not very strong, however, in comparison to the volume of air coming through the side vents or the vents above the heater/cooler controls. How would I check to see if a flap is not opening? Appreciate your reply!

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Ozark Lee

Re: Air through vents not very strong

Post by Ozark Lee » Thu Aug 09, 2018 4:40 pm

If you have an AUT setting it is the automatic version. The MCC doesn't have an AUT.

Usually it is a bad damper flap motor or the gear that is a part of the motor assembly. The motors are located on the sides of the climate unit and you can get to them by removing the lower dash panel on the right hand side and crawling into the foot well on your back. There are three motors, one on the left side and two on the right. The defrost damper motor is on the right hand side, toward the seats I think.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

5rivers
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5rivers

Re: Air through vents not very strong

Post by 5rivers » Thu Aug 09, 2018 9:19 pm

Thanks for your reply, Lee!
I will wait on assessing the motors on each side of the climate control unit; need to make a few more repairs so the car passes NYS inspection! I will keep you posted :)

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abscate
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abscate

Re: Air through vents not very strong

Post by abscate » Thu Aug 09, 2018 9:54 pm

How you coming on that car five rivers?

Let us know if you need help
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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5rivers
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5rivers

Re: Air through vents not very strong

Post by 5rivers » Fri Aug 10, 2018 8:34 am

Hey abscate, how are you?
The grey Volvo has been sitting since the transmission/clutch gave out.
But, the new-to-me dark blue '98 Volvo V70 base is coming along.
Thanks for asking!
I suspect I will be posting more questions as I get into the climate control area.

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abscate
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Re: Air through vents not very strong

Post by abscate » Fri Aug 10, 2018 2:24 pm

I missed that the clutch went on silver... 😢

The blue is a nicer color though...
Empty Nester
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