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1998 Volvo S70 5CL Non-turbo A/C Electrical ECM

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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neklund30
Posts: 19
Joined: 21 February 2013
Year and Model: 1998 S70
Location: Houston

1998 Volvo S70 5CL Non-turbo A/C Electrical ECM

Post by neklund30 »

Hi,

I took my car to a shop and they check the voltage of the A/C relay in the ECM and was reading 3.5 volts and not 12v. They told me that they reset the head unit and the compressor kicked on. It seems that I have a electrical problem steeming from the head unit itself. I notice on my dash, red lights flicker on my a/c panel even when my a/c is off. How often does the actually a/c unit in the dashboard malfuntion in the S70s?

jblackburn
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Posts: 14043
Joined: 8 June 2008
Year and Model: 1998 S70 T5
Location: Alexandria, VA
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Post by jblackburn »

It's certainly not unheard of. It was more common in the early 850's, but there are plenty of things that can go wrong in there.

A junkyard will be your friend. I suspect that the control module from a 1999-2000 is different, so try to find a 1998.

The AC relay behind the glovebox have also been known to go bad on these cars.
'98 S70 T5
2016 Chevy Cruze Premier


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!

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