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98 Volvo S70 N/A - Ac blowing cold, but out the wrong vents.

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.

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ATarnowski
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Year and Model: S70 Base Auto 1998
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ATarnowski

98 Volvo S70 N/A - Ac blowing cold, but out the wrong vents.

Post by ATarnowski » Sun Aug 12, 2018 7:59 am

So for years my S70 has had semi working/leaking ac but its ran cold, and now has stopped leaking so ive been using it more. Anyways, since the beginning apparently, (I’m not the first owner), the air conditined blowing air has always shifted between all of the settings, (face, feet, defrost and a mix of each one) every time I select the face setting on the knobs. I will get to what unit I have in a minute. Recently, even when I select face it just goes instantly to defrost. Ive checked my blend gates and they seem to be working. I have also unplugged the whole control knob panel while the car was running and that fixed it during the time the car ran, (face vents full blast), but then after the car was turned off then back on it went back to broken. I’m guessing this is a computer issue within the knobs used to control the whole system. Now for what I have... I have the 5 speed non variable fan, with cable driven heat and ac doors. This is my first time posting so hopefully this is all in the right spot. Thanks!

-Adam
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bmdubya1198
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bmdubya1198

Re: 98 Volvo S70 N/A - Ac blowing cold, but out the wrong vents.

Post by bmdubya1198 » Sun Aug 12, 2018 8:30 am

If you think it may be an issue with the MCC unit, you could get one at the junkyard and swap it out. I'm not too familiar with the MCC, but how do the cables look? If they are stretched/damaged, that could surely cause problems.
2000 V70R Venetian Red/Charcoal M56 Swapped 197k
2003 S60 2.4T Silver/Black 113k
2007 XC90 V8 AWD Sport Titanium Grey/Black 171k
1991 944 Turbo Dark Green/Beige 174k
1992 245 Base White/Beige 249k
2006 BMW 330i
1999 BMW 528i
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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abscate
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abscate

Re: 98 Volvo S70 N/A - Ac blowing cold, but out the wrong vents.

Post by abscate » Sun Aug 12, 2018 1:52 pm

They are pretty rare here.

I thought the air distribution was completely cable controlled but your description does not fit that model at all.

Give people who have MCC A few days to hammer on this.....MCC Hanmer...I’ll be here all week
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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bmdubya1198
Posts: 4077
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
Location: Charlotte, NC
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bmdubya1198

Re: 98 Volvo S70 N/A - Ac blowing cold, but out the wrong vents.

Post by bmdubya1198 » Sun Aug 12, 2018 4:10 pm

abscate wrote:
Sun Aug 12, 2018 1:52 pm
They are pretty rare here.

I thought the air distribution was completely cable controlled but your description does not fit that model at all.

Give people who have MCC A few days to hammer on this.....MCC Hanmer...I’ll be here all week
Good one... :lol:

MCC cars are pretty rare though, most of them are ECC. There is usually one hanging in my local junkyard.
2000 V70R Venetian Red/Charcoal M56 Swapped 197k
2003 S60 2.4T Silver/Black 113k
2007 XC90 V8 AWD Sport Titanium Grey/Black 171k
1991 944 Turbo Dark Green/Beige 174k
1992 245 Base White/Beige 249k
2006 BMW 330i
1999 BMW 528i
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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