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Car Forum / Volvo Cars / July 2006

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Volvo S80 1999 - Why do they cool the computer with air from climate control system?

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Deacon Eisenhart - 16 Jul 2006 01:07 GMT
Upon finding the low side of my a/c system to test pressure, I noticed that
the box next to the antifreeze and power-steering fill tanks (which contains
two computers from the looks of it), is fed air from the climate control
system to cool the computer modules.

I wonder why they didn't just put the computers inside the passenger
compartment like MOST other cars?  Seems like a lot of abuse under the hood
and complexity of now blowing cool air over them?  I wonder if it blows hot
air in the winter?

I'm confused - has anybody ever thought about why they did it that way?
Usually, they have their reasons?

Regards,

Deacon Eisenhart
poopbunny - 16 Jul 2006 12:59 GMT
Possibly because the passenger compartment can be hotter for when the car is
left out in the sun?

> Upon finding the low side of my a/c system to test pressure, I noticed that
> the box next to the antifreeze and power-steering fill tanks (which contains
[quoted text clipped - 12 lines]
>
> Deacon Eisenhart
Deacon Eisenhart - 23 Jul 2006 01:16 GMT
I thought that myself about passenger compart being hotter at times... Well,
I guess I shouldn't lose sleep over it.

I can't imagine wiring would be the issue, but that is a thought too.

Deacon

> Possibly because the passenger compartment can be hotter for when the car
> is
[quoted text clipped - 20 lines]
>>
>> Deacon Eisenhart
Tim.. - 24 Jul 2006 08:42 GMT
> I thought that myself about passenger compart being hotter at times... Well,
> I guess I shouldn't lose sleep over it.
>
> I can't imagine wiring would be the issue, but that is a thought too.

On the 850 the ECU box was cooled via forward motion of the car, or when the
cooling fan was running through some pipes before and behind the radiator.

On the 70 series Classic the arrangement is as the 80 series, the interior
fan pulls air through the ECU box instead.

I'm not sure why either!!

Tim..
John Horner - 19 Jul 2006 05:21 GMT
> I'm confused - has anybody ever thought about why they did it that way?
> Usually, they have their reasons?

Maybe to keep the wire lengths short between the computer and the
various sensors and controls it integrates with?

John
 
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