Question about 1992 Volvo 240

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Full-time heat in car: heater valve?

1992 Volvo 240: Heater delivers hot air even with control set to cool. I suspect it is the heater valve, not the connecting cable (as there is still tension when you slide the dash control). How much of the dash has to be taken apart to troubleshoot/repair? Where to begin? Is this a job for a semi-mechanical person? Is this an expensive repair if I take it into the shop? mark in rochester

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This problem is caused by the air temperature control blend door motor, the part is cheap, but the dash must be removed to install the new part.

Posted on May 12, 2009

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1 Answer

Heated air still comes out of my vents even when the air is off


You might have a faulty water valve. The hot air in the car is supplied by the engine cooling system. As the engine works, it heats up and water is circulated through the system and kept at a cooling level by the radiator. However, this water is still hot, and by turning on the heat in the car, a valve is opened that allows the hot water to circulate through the heater core inside the car.
This core is in fact just a mini radiator, and air from the blower fan inside the car blows air through this mini radiator, thus supplying hot air in the car.
If you don't want hot air in the car, the heater control operates a valve that shuts off the hot water from the engine. If this valve is faulty, it will allow hot water to circulate through the system. Another possibility is that the cable operating the water valve might be maladjusted or the cable or the lever operating the cable is broken or faulty. It often happens that the outer part of the cables slip and the controls operate so-so but never well.
If the cables to the dashboard controls are not adjusted properly or have started slipping, it could also cause the fresh air vent to not close properly, and this will cause a flow of air even when the controls and the fan are turned to the off position.
You can remove the control panel from the dash and check the cables and controls, but it is a finicky job. Maybe you want to take the car to a mechanic?

Mar 29, 2014 | 2001 Nissan Sentra

3 Answers

I put a brand new heater core, radiator, water pump an thermastat but it still takes forever to blow heat out an then it doesn't get that hot.. what's the problem? my vehicle is a 1995 jeep wrangler 2.5 4...


Could be the heater bypass valve is stuck or the heater core is blocked.
I'd check the heater core first.You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses. With the engine idling at normal operating temperature, set the temperature control knob in the full hot position, the mode control switch knob in the floor heat position, and the blower motor switch knob in the highest speed position. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets.
Temperature Reference
Ambient Air Temperature 15.5° C (60° F) 21.1° C (70° F) 26.6° C (80° F) 32.2° C (90° F)
Minimum Air Temperature at Floor Outlet 52.2° C (126° F) 56.1° C (133° F) 59.4° C (139° F) 62.2° C (144° F)
If the floor outlet air temperature is too low, Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow: Pinched or kinked heater hoses. Improper heater hose routing. Plugged heater hoses or supply and return ports at the cooling system connections. A plugged heater core. If proper coolant flow through the cooling system is verified, and heater outlet air temperature is still low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat: An obstructed cowl air intake. Obstructed heater system outlets. A blend door not functioning properly.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control knob on the A/C Heater control panel, the following could require service: The A/C Heater control. The blend door actuator.
The blend door. Improper engine coolant temperature

Dec 04, 2010 | 1995 Jeep Wrangler

1 Answer

The heater control knob will not turn all the way to either hot (right) or cold (left) so therefore I only get medium warm or medium cold. I assume the knob moves a cable but I cannot see it or remove the...


Cable is probably kinked or slipped adjustment. There are 2 cables connected to the knob. One move the blend door in the heater box to make the air flow thru the heater core, and the other cable opens a valve in the heater hose (engine compartment) to let the hot engine water into the heater core. Check both cables for kinks and fix and kinks. It is still doesn't work, first disconnect both cables at the blend door and valve and check the door and the valve for proper operation (can you open and close them by hand?--if not, these must be repaired or replaced), then, if good, adjust the cables according to this procedure from autozone.com:


CONTROL CABLE Adjustment

  1. Under the hood, open the clamp and disconnect the heater control valve cable from the arm.
  2. Under the dash, detach the air mix control cable from the clamp. Pull the cable from the control arm.
  3. Position the temperature control at MAX COOL.
  4. Turn the air mix control arm counterclockwise until it stops.
  5. Attach the air mix control cable to the arm.
  6. Snap the air mix cable hook into the cable clamp.
  7. Under the hood, turn the control valve to the fully closed position.
  8. Install the heater valve cable to the arm.
  9. Gently pull on the cable housing to remove any slack.
  10. Insert the cable into the clamp.

Oct 20, 2010 | 1996 Honda Accord

1 Answer

I have bmw 318ci and the hot air is not working, the heater is blowing and set to max heat but only blowing cold air, i have checked the fuse box, any ideas??


The heater operates from the hot water from the engine cooling system flowing through the heater radiator which is inside the air ducts under the dash. I suspect that the control wire/cable that goes from the heater control lever has broken or become disconnected from the heater tap that controls the volume of hot water through the heater radiator. Some times there is also a flap in the air ducts that is operated by the heater lever tha varies the amount of air that is heated. The tap may be in the engine bay or tucked in behind the air ducting.

Aug 31, 2010 | 2000 BMW 3 Series

2 Answers

Luke warm heat heat is not hot enough


one of air vents is blocked or you have open thermostat all the time and the car does not get warm enough

Nov 22, 2009 | 2004 Volvo XC90

3 Answers

My 2001 toyota tundra heater wont blow hot air. I checked to see if the heater core is cloged it seems fine the heater control valve is operating properly, and I changed the thermastat. and yet the heater...


If you've changed the coolant recently, it could be air locked in the heater core. To remove park the truck with the front higher than the back and remove the radiator cap. Start the engine and let it run while watching for a big air bubble burp coming out the radiator neck. Top off the coolant and continue.

Nov 12, 2009 | 2001 Toyota Tundra

2 Answers

Cannot get heat even after changing thermostat in 1992 honda accord what do i check next


Check the heater control valve. It is usually behind the engine up next to the firewall. Have someone inside the car move the heater control to heat. A lever on the heater control valve should move when this is done.

This valve allows hot coolant to enter the heater core inside the car. If this hot coolant doesn't arrive, you have no heat.

Oct 14, 2009 | 1992 Honda Accord

1 Answer

1992 es 300 lexus heater is blowing cold


. Yes it could. some are vacuum powered, cable powered (mechanically) or electric powered. If the valve does not open. The hot water will not get to the heater core. It could also be the thermostat not opening.

Jan 20, 2009 | 1992 Lexus Es 300

1 Answer

Sticky valve


first check to see if theres even enough coolant in the car first if ther is get a buddy to turn the temp to hot then cold from inside the car while you watch the heater control valve it sits almost directly on the fire wall it is connected in line on the inlet heater hose and has a cable connected to it see if the cable moves when your friend moves the control knob if it moves your problem could be in the blend door motor or control head if the valve is the problem it is pretty easy to replace just take your time to bleed the cooling system of air after the repair

Dec 31, 2008 | 1999 Acura TL

2 Answers

1992 volvo 240 radiator fluid on driver's side floor.


the only way to find out is to have someone with a pressure tester pressure test the cooling system.

Nov 22, 2008 | 1991 Volvo 240

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