Question about 1998 Volvo S70

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1998 Volvo S70 2.0 L Air conditioner not working correctly

Has always supplied little heat to the floor area. Does not respond to correct directional setting.
Always blows hot air up the windscreen wherever the flow is directed. Only stops is the system is turned off.
Now blowing hot air to the passenger side despite setting it for cold. (Not very useful when it is 32 degrees outside)
The temperature control dial has lost its 'clicks' & is smooth to turn.
Do hope you can help? Is there any diagrams available on-line?
Thanks you - Joan Blanch

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Hello Joan,
The climate controls on your Volvo are all electronic at the control end, but likely have little vacuum motors to control the opening and closing of heater valves and air directional flaps in the innards of the dashboard. With the "mature" nature of your vehicle, it is sometimes a cracked vacuum hose or that the rubber end is getting a little hard and now leaking at the nipple where it is plugging into the vacuum valve. IF this is the issue, you MAY be able to here a hissing noise immediately after turning off the engine. Crawl down and get your head (ears) right under the dash. There may be a cardboard/plastic cover plate on the underside of the dash that you have to remove to get access.
But from the symptoms that you describe in your post, "Temperature dial has lost it's clicks"... I SUSPECT that the contacts on the control module may be totally worn out for both the direction of flow and the temperature control. Modules are available on eBay/Amazon (usually used) and it should be quite straight forward on how to remove / replace. The link below provides both links to purchase the control and also some YouTubes on how to replace it.
Hey... do you have a Pick-n-Pull or similar self-serve auto-wrecker near by? Often you can see what vehicles they have on their lot. It appears that s70 v70 and c 70 Volvos from 1998-2000 all have the same control unit. I've also included the part number in one of the photos... do a search for that and you may find more hits.

I hope this helps you Joan!
1998 Volvo S70 2 0 Google Search

Posted on May 15, 2017

  • 1 more comment 
  • Denis FixYa Chalifoux
    Denis FixYa Chalifoux May 15, 2017

    The image didn't load the first time...

  • Denis FixYa Chalifoux
    Denis FixYa Chalifoux May 15, 2017

    Does this look like your Climate Control Unit?

  • Denis FixYa Chalifoux
    Denis FixYa Chalifoux May 15, 2017

    JOAN... STOP... before replacing the control unit, it MAY be that the temperature SENSOR might be covered in lint. It is usually found in the vent just to the right of the steering wheel. Get a good bright LED lamp and look carefully into the vents. You should see the sensor in one of them. Take a can of "air blast" or the end of a compressed air hose. If you don't have a compressed air blaster, stick a key in the end of a tire fill-up air hose while pointing it into the vent OR if the opening is large enough, get in there with your hubby's, brother's etc toothbrush. (Rinse out the toothbrush before putting it back! :) /denis

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SOURCE: 1998 Volvo S70 2.0L Air conditioner not working correctly

This may be one or two different problems. One could be the climate control unit itself. Surprisingly the problem with the air not changing the source will likely be remedied by a reprogramming by a Volvo dealer. Defrost is the delfault outlet if there is a problem with that system. As for the dial not having detents and the cold instead of hot air in the pass side, that could be programming, a disconnect with the heater door for the passenger side or it could be the control unit. 98 is a difficult year to diagnose and the dealer is likely the only one who can properly diagnose this car. The download at the dealer is an inexpensive fix. If there is a mechanical problem within the air system that could prove more costly. I'm not sure how much the control unit for the climate control system, but there are usually quite a few on ebay. Good luck and I would suggest visiting the dealer first for this one as it is the least expensive fix and could very well be the only problem.

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SOURCE: installation instructions/diagram for 1998 volvo s70 starter

IT is very easy get all of the intake ducts out of the way to get access to the starter motortakk off rubber boot and first disconnect neg battery terminal next unbolt two bolts that hold starter and the 3 wires and ground terminal from starter (i have a 14 millimeter wrench that i cuit in half to make removal easier) and you should be all-set

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SOURCE: Air Conditioner

There is a low side connection underneath the power steering reservoir. The reservoir must be lifted up in order to access this.

Posted on Jul 19, 2009

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