1999 S70 T5 Heater AC Blower motor speed slow not working

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
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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blandis
Posts: 106
Joined: Fri May 29, 2009 3:27 pm
Year and Model: 99 S70 T5
Location: Dallas, TX

1999 S70 T5 Heater AC Blower motor speed slow not working

Post by blandis »

Not sure if my two problems are related or not.

A week or so ago I turned the drivers side temp control down and it went past the lowest setting. Like the "stop" or limit stop broke. I can now turn it to 3 o'clock. It will also go past the highest setting. I assume the plastics inside broke. Dont remember using the fan after this which is why I am wondering if they are related.

Monday morning my heater/blower fan was set on high but blowing at about 1/3 speed. Worked for a while then just quit. Did the same again yesterday. Seems to work a while then stop. Setting the temp to auto or changing the temp setting has no impact on the fan working or changing speed. Will test again today and report back if needed. Did a quick search and did not find anything definitive.

When these motors go out do they quit completely. Is there a relay or diode that goes bad.

Thank you in advance for your help.
Brad
Dallas, TX
1999 S70 T5
2006 XC90 2.5T

Ozark Lee
MVS Moderator
Posts: 14798
Joined: Thu Sep 07, 2006 8:24 am
Year and Model: Many Volvos
Location: USA Midwest
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Post by Ozark Lee »

It sounds like the knob itself broke at the point where it plugs into the temperature adjustment control shaft on the controller. I have had some very limited luck gluing the knob socket back together if all of the pieces are there. The driver's side and passenger's side knobs are interchangeable so even if it is repaired you might want to swap them.

As far as the fan control goes you can't really tell for sure what is going on without a VIDA/DICE scan. It could be a problem in the control head, or the blower, or the power stage that varies the blower speed. I am going to assume that the AC and REC lights flash for a couple of seconds at startup. That is an error indicator although the flashes themselves don't give you any further information. A dealer could scan it for sure but I think many independent shops that do Volvo work have VIDA/DICE as well and they will likely scan it for a lot less money.

If you get real lucky another one of our members in your area has VIDA/DICE and will volunteer to scan it.

...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

blandis
Posts: 106
Joined: Fri May 29, 2009 3:27 pm
Year and Model: 99 S70 T5
Location: Dallas, TX

Post by blandis »

Lee was affraid that was going to be the answer.

Any input on the iCarsoft i906 tool? $140 on ebay shipped. Wife drives a 06 XC90 with the 2.5T so could use it on her car as well.
Brad
Dallas, TX
1999 S70 T5
2006 XC90 2.5T

Ozark Lee
MVS Moderator
Posts: 14798
Joined: Thu Sep 07, 2006 8:24 am
Year and Model: Many Volvos
Location: USA Midwest
Has thanked: 4 times
Been thanked: 56 times

Post by Ozark Lee »

I'm not familiar with the iCarsoft tool. The street price for VIDA/DICE is a fuzz less than that for the clones but it is strictly Volvo and won't do a thing for other makes. With two post '99 Volvos it might make sense for you to pick one up. There is a forum on this board that is all things VADIS, VIDA, and DICE with numerous suggestions on sources for units that work and setup help. Not all DICE clone units are created equally.

Whatever you do don't try to use VOL-FCR on a '99. I lied to VOL-FCR and told the program that my '99 was a '98 and I think it managed to corrupt my ECU. The car would rarely start after that incident and I had to get the programming cloned into another ECU to get the car to run again.

...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

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