Question about 1998 Volvo S70

1 Answer

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

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 20 answers of more than 400 characters.


    An expert who has answered 20 questions.

  • Expert
  • 25 Answers

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



6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 16 Answers

SOURCE: volvo s70 radio code

You must take the car to a Volvo dealer so they can reference the code from the VIN number. If you call it in, they only assume you stole the radio. Sometimes you have to prove you own the car.

Posted on Oct 31, 2008

  • 22 Answers

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.

Posted on Feb 20, 2009

  • 109 Answers

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

Posted on May 31, 2009

  • 377 Answers

SOURCE: 1999 volvo s70 will not start sometime after door unlock

Try to check the battery and the alternator and the fuse make sure the battery connector is not loose.

Posted on Jun 09, 2009

  • 42 Answers

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

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a 2008 Toyota Corolla and heat on the left side and the right side is cold, what to do?

Heat is blowing on passenger side, but cold air ... - RepairPal > Questions > Dodge > Ram 1500 > 2002 Dodge Ram 1500
Dec 7, 2009 - When I turn on the heat, the passenger side is receiving warm/hot air but ... blow hot air on the drivers side and it would get cold right away. about a week ago... I have a 2008 Dodge Ram 2500 SLT. ... Regardless of the settings cold air blows from the left vent and on the floor on driver and passenger sides.

Temperature Blend/Recirculation Doors May Fail and ... > Problems > Jeep > Grand Cherokee
2008 Jeep Grand Cherokee143,000Visitor. I get cold air on driver side and warm air on the passenger side. Upvote (29) ... right side air is always at the coldest. no heat on the right side and air temp will not change, left side works good. .... Models: · Honda Accord; ·; Toyota Camry; ·; Honda Civic; ·; Acura TL; ·; Toyota Corolla ...

Heating and AC Temperature and Air Delivery Mode Do

Jan 16, 2016 | Toyota Cars & Trucks

1 Answer

Heat does not blow onto windscreen but blows through other vents - whats wrong

What make an model an year vehicle do you have ? The air blows out of the floor vents an center vents but not defrost ? Possible mode actuator , stuck mode door ! There is a door inside the heater / A/C assembly that directs the air to the desired position . These doors can be moved by a vacuum operated actuator or an electric motor . Sometimes thing's put on the dash end up inside the heater box , fall through defroster vent ! Pens , pencils etc.. Depends on the make vehicle an system , manual , or automatic climate control . Some of the newer vehicles the HVAC system as it is called , the control panel is a electronic control module an can store DTC'S - diagnostic trouble codes !

May 07, 2015 | Cars & Trucks

1 Answer

How to repair

i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move

May 01, 2014 | 2004 Ford Crown Victoria

1 Answer

2001 corolla heater cold

Sounds like either the water valve isn't working or the flap that controls the direction of the hot air isn't connected. Check that the cable that controls heat and air are connected
. They may have come off at some time or the valve is frozen

Jan 26, 2014 | Toyota Corolla Cars & Trucks

1 Answer

Replace fule cover on 1998 Volvo s90

What is a "fuel cover"? You may have to supply the correct terminology and ask a specific question for more help.

Sep 22, 2013 | 1998 Volvo S90

1 Answer

1998 volvo s70 clock resets itself to 12:00

It sounds like the memory's low voltage supply is cut off.

Nov 10, 2012 | 1998 Volvo S70

1 Answer

Rear Floor Vent heat only

Sounds like your heater coolant hose door flap is broken or loose. May want to check behind the heater controls, if your components are mechanically operated. If electronically, may need to perform more troubleshooting before replacing this component.

Jun 17, 2017 | 2004 Ford Econoline

1 Answer

My 1993 Z28 camaro blows strong air but not cold in summer and defrost will not clean the windows. What could be the cause of this problem?

My Camaro's are all victoms of the air flow control vaulve. My 77 had a cable that phyisically opened and shut off air flowfrom the heat and cold side and operated as I moved it from cold to heat. Then they came out with Vacuum assisted air control units that when the rubber vaccum tube dehydraded, it would be stuck in what ever it was in last, say A/C, or if u had the heater on that day. You have either cables or air hoses that open and close certain doors under your dash according to where you place the enviromental control to. 9 times out of 10, that control mechinisim froze up, a plennum door could have broken off leaving that area always open and the heater is always off. Check the book, im not 100% but it may be all electronic in the 93's if so, first check your fuses. Also check the passenger floor board for dampness. If the passenger floor board is wet, then your heater core ruptured also. It's a mini radiator under the pass. side dash. But the real deal is the air vents that open and close according to your input are not moving at all, and if they are electronic well Don't rip the dash out, that is a pain to reinstall LOL, Best bet is to take it to the chevy house because if you get the book, u'll see theres quite a few moving parts and with old plastic and them dehydrating, you can easly brake a door control and make matters worse. Good luck.

Sep 18, 2012 | 1993 Chevrolet Camaro

1 Answer

1995 Volvo 850 Turbo I neeed to recharge air conditioner however on line instruction show you must re-charge from hi pressure side and about half say recharge fro low pressure side which is correct.

You never ever charge any refrigerant system in the
world from the high side

Always the low side,as you want to add it in a gas form

If you invert the can & charge hi side ,liquid ref will

ruin the compressor, as it can't compress a liquid

Jun 29, 2011 | 1995 Volvo 850

Not finding what you are looking for?
1998 Volvo S70 Logo

Related Topics:

145 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volvo Experts


Level 3 Expert

76051 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8265 Answers

Are you a Volvo Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides