Question about 1998 Volvo S70

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1998 Volvo S70 2.0L Air conditioner not working correctly

1. Has always supplied poor heat flow to the floor area.
2. Has always blown hot air up the windscreen despite correct directional flow settings.
3. Now blowing hot air to the passenger side instead of cold when selected.
4. The temperature dial turning freely instead of with little clicks.

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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

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No heat or air 1998 S70 vovlvo

Posted on Oct 15, 2010

  • Anita Daukei
    Anita Daukei Dec 10, 2013

    I HAVE A 2004 BUICK LESABER AND THE THERMOSTAT HAS BEEN CHANGEDAND MORE COLLANT ADDED; BUT IT STILL BLOWS COOL-COLD AIR. WHAT CAN POSSIBLY BE THE PROBLEM?

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2 Answers

Put in new thermostat heat is not blowing out like it should what can it be


So there are two systems to consider here. First you have the heated water that would supply the heat for your heater. Water circulates from the engine (hot) through the cooling system (water pump, hoses) regulated by the thermostat and to the radiator to be cooled off. Once the car is warmed up, both heather hoses should feel very hot. If one is real hot and one is luke warm, the water/coolant mixture is not flowing though the heater core. Some heater cores have valves called heater control valves. If the value is closed or stuck, then this could be the fault. If there is no control valve or there is flow after the valve, then the heater core itself is plugged. It is like a small radiator and the area for the water to flow is very small, so they do plug over time.


The other system to consider is simply the ducts in your dash board. When you select cold a flag will close off air flow to your heater core. You should feel resistance with manual levers since they are moving mechanical flaps. Over time the plastic pieces may become brittle. Other valves can be vacuum assisted. If all that ever works is the defroster and you can never get hot air out of the vents, you most likely have a vacuum leak. I always check the small vacuum supply line coming off of the firewall first.

So to recap, check both heater hoses. If they are both equally very hot, water is flowing and you will want to move on to the under dash linkage to see if the door is closed to the hot air supply.

Mar 05, 2014 | 2000 Kia Sportage

1 Answer

Heat not working


Sounds like the air blend door is not opening to let heat in.

Engine coolant is provided to the heater system by two 16 mm (5/8 inch inside diameter) heater hoses. With the engine idling at normal running temperature, set the heater-A/C controls as follows. Temperature control to full Heat, Mode control to Floor, Blower control to the highest speed setting. Using a test thermometer, check the air temperature coming from the center floor outlets and compare this reading to the Temperature Reference table.

If the floor outlet air temperature is insufficient, check that the cooling system is operating to specifications. Both heater hoses should be HOT to the touch (the coolant return hose should be slightly cooler than the supply hose). If the coolant return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in heater system.

POSSIBLE LOCATIONS OR CAUSE OF OBSTRUCTED COOLANT FLOW
If coolant flow is verified and the heater floor outlet temperature is insufficient, a mechanical problem may exist.

POSSIBLE LOCATION OR CAUSE OF INSUFFICIENT HEAT
  • Obstructed cowl air intake.
  • Obstructed heater system outlets.
  • Blend-air door not functioning properly.
TEMPERATURE CONTROL
If heater floor outlet temperature cannot be adjusted with the heater-A/C control temperature control lever, one of the following could require service:

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1 Answer

Air conditioner


sure.

what is your goal hot air, you never said,

got full fan speed? on high>? sure.
got full engine coolant heat 180F or more holding??? if not all is lost.
if car has a heater core water valve is it open>?
are the 2 heater core water tubes both fully hot,(hand test)
yes> good.
now you need air flow through the core (heater)
that means the damper most be open,, is it?

in that order. (heat)
the dampers on hondas can be complex. (10x on electric damper motors , aka, damper actuators)
see part 5 and 6 here
http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=ACCORD&catcgry2=2002&catcgry3=2DR+EX&catcgry4=KA4AT&catcgry5=HEATER+UNIT

the fSM covers the complex tests of dampers, and not having
a real FSM makes this near impossible.
why , because your dampers are no like anyothers on earth.
other cars use different types. and are all unique .
unlike CABLES
unlike vacuum servos.
see>?

here are the basics for heat.
http://www.fixkick.com/AirCond/heater.html


Jun 04, 2013 | 2002 Honda Accord

1 Answer

P0101


Here is the definition of the code.

P0101 GMC Description The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).

The temperature of the hot film is controlled by the ECM acertain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change.
Faulty mass air flow sensor
- Intake air leaks
- Dirty mass air flow sensor
- Dirty air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
Read more: http://engine-codes.com/p0101_gmc.html#ixzz223ibNx6t

Read more: http://engine-codes.com/p0101_gmc.html#ixzz223i9HR3J

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2 Answers

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1 Answer

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---
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