Question about Peugeot 406

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Heater control problem Peugeot 406 1998 manuel

The heater will only give cold air choose where the heat conrol is positioned
The coolant is up to working temperature with no coolant lose, also no air locks. I suspect a problem with the direction flaps, if so how do you gain access to the controls is it a dash out type job or is there an easier way

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Hi there,
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Posted on Jan 02, 2017

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alicantecoli

Colin Stickland

  • 22484 Answers

SOURCE: Peugeot 406 SV rear seat removal

take it you have done it------- two brackets at front of seat

Posted on Nov 20, 2008

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ash seder

  • 166 Answers

SOURCE: peugeot 406 hdi

very hard to diagnose these cars go to dealer and get checked it is the only way to fix these kind of issues

Posted on Dec 20, 2008

honest ern

  • 6 Answers

SOURCE: Peugeot 406 HDI 110hp 2001.Replacing injector seals.

they are easy to remove. they are held by a small clamping bolt/bracket and sealed with copper washer. watch for high pressure fuel in lines.

Posted on May 04, 2009

David TULLY

  • 277 Answers

SOURCE: 02 Jaguar S Type - Heater blowing cold air

Has the vehicle overheated recently, if not there is a failure of the Coolant from engine valve controller, that measures flow through the Heater Matrix. Come back with more, as necessary.
Regards,DT

Posted on Aug 29, 2009

emissionwiz

Marvin

  • 85206 Answers

SOURCE: how to bleed a hydraulic clutch on a peugeot 406

you need to buy a vacuum clutch bleeding tool make by a company called MITYVAC

Posted on Sep 14, 2009

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1 Answer

Why won't the door of my heater open to let the heat into the interior. The fan is working fine, but no heat is coming out, only cold air.


check heater conrol valve under hood if in heater position check the vacuum hoses in dash or the switch that changes the door position

Oct 05, 2014 | 1993 Jeep Wrangler

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Car heater blowing hot air all time


THE HEATER CONTROL CABLE, VALVE, OR SOLENOID IS STUCK OPEN......LETTING COOLANT INTO HEATER CORE AT ALL TIMES
FIND BAD COMPONENT-REPAIR

Jul 21, 2013 | Peugeot 306 Cars & Trucks

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Heater won't put out hot air


Hello Pall.

There are a few things that will cause a no heat problem.

First of all, check the coolant level. If it is very low, the coolant will not flow through the heater core.

Next is the thermostat. If it sticks open the coolant will flow through the radiator all the time taking away all the heat developed in the engine.


If those check out OK, then check the two hoses that carry the coolant to the heater core.
Both should be hot to the touch and very close to the same temperature.
If one is cooler than the other there is a restriction in the heater core and it will need to be flushed out or replaced.

Next is to make sure the temperature control on the heater box is working.
This is controlled by the dial on the dash and activates a motor which moves a door in the heater box that controls hot/cold airflow. Sometimes the motors on these pickups would go open circuit and quit working.

If you would like further assistance with this problem, please ask me in a comment here.

Thank you for using FixYa.

Kl

Feb 10, 2011 | 1999 Chevrolet S-10 Pickup

1 Answer

No heat in my 94 Accord, replaced thermostat. Moved heater conrol gate valve by hand to every position, and still no heat. What is causing the lack of heat? Car is warmed up and idles well.


Hi,
it would appear that a heater door under the dash is not operating.However, check the route of the heater hose from the engine to the bulkhead which feeds the heater, then check the hose FROM the bulkhead back to the engine.The return line to the engine should be marginally cooler, If it is cold / cool then coolant is not flowing through the heater core. Locate the hose at the highest point of the engine, slacken it, and with the engine warm, bleed the coolant flow. Wear a long sleeved shirt / coveralls, gloves and safety glasses.

Everything ok? Then check for the operation of the heater door under the dash. Engine at idle, move the heater control and listen for the door closing. Also ensure that your air circulation lever is set for the car interior.

If you can't hear the door operating, you will have to do a visual insp under the dash.

You do not mention your skills level, so I would not presume to issue instructions for that task.

Good luck.

Jan 31, 2011 | 1995 Honda Accord

2 Answers

Heater only blows cod air even when engine is warm. changed thermostat. doesnt fog up ad smell like haeter core.


Your car's heater is a life saver in cold weather. Before attempting to repair your car heater, you should understand how your heater system works. First, on this page is an explanation of how the car heater system functions, further down the page are some pointers on heater system trouble-shooting. To warm the passenger cabin of your car, the heating system makes use of excess heat from the engine internal combustion process. A car's engine, in fact, when in operation produces so much excess heat that if the excess heat is not removed, it would destroy the engine. It is your car's cooling system that removes that dangerous excess heat. Some of the excess heat is released through the exhaust. Most of the excess heat is absorbed by a circulating liquid coolant, which is a mix of water and antifreeze. The heated liquid coolant is carried from the engine through hoses to the radiator, which transfers the heat from the coolant to the outside air. That heat transfer lowers the temperature of the liquid coolant, which is then circulated back to the engine to absorb excess heat again. Whereas the radiator is located at the car front grill, the unit that transfers heat to the passenger cabin is located inside the dashboard. This unit is something of a mini-radiator and is referred to as the heater core. Heated liquid coolant circulates through tubes in the heater core and a heater fan blowing across those tubes, as well as through little fins encasing the tubes, directs warm air through heating vents into the passenger cabin. Because your car's heating system works off of its cooling system, heating system malfunctions are often caused by problems in the cooling system. The heater core in your car is similar to the radiator in the front of your car; in fact it looks like a small radiator. The difference is the heater is mounted inside the car and air is blown through the fins of the core. The heater hoses transfer engine coolant from the engine to the heater core, this allows the heat from the engine coolant to be utilized and warm the passenger compartment. When a heater stops functioning determine what type of failure has occurred to execute a repair. We have listed the most common problems below:
heater_core.jpg
Heater Core
Troubleshooting Procedure
  • Step 1: Check Engine Coolant Level - Most cars have coolant reservoirs with opaque white plastic tanks and measuring lines allowing you to see if the coolant is at the recommended level. Coolant expands when heated, and for that reason, most coolant reservoirs have a Full-Cold and a Full-Hot line. If there is too little coolant in the reservoir, you should be alerted to the possibility that there could be a leak somewhere in your car's cooling system. Remove the reservoir cap and add coolant to the Full-Cold line, if a very short time after you refill the coolant reservoir the coolant level is low, there is a leak in your car's cooling system. Engine coolant is used to heat the heater core and if the vehicle is low on coolant the heater core will stop working. The heater cannot produce heat due to the lack of heat from the engine coolant. Even if the engine is not over heating the coolant level can still be low. Inspect the engine coolant level in the coolant reservoir tank; coolant level should be between the hot and cold marks. Always check the coolant level when the vehicle is cold, preferably over night. Check for engine coolant leaks and repair as needed, then refill with coolant and recheck the system.
    radiator_cap.jpg
    Radiator Cap
  • Step 2: Inspect Heater Control Valve - The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced. After the repair has been made refill the coolant level and recheck system.
    heater_control_valve.jpg
    Heater Control Valve
  • Step 3: Check Vacuum Feed - Most heater systems are operated by engine vacuum. This vacuum is used to actuate servos to move the temperature adjustment doors inside the heater plenum. If engine vacuum is not present the heater will not operate properly. To test for this condition remove the vacuum feed line from one of the vacuum servos. With the vacuum feed line removed insert a vacuum test gauge. If no vacuum is present, open the hood and inspect all small vacuum lines from the engine to the firewall and repair as needed. If a hissing noise is present under the dash when the engine is running a vacuum leak exists and must be repaired to restore heater function.
  • Trouble Shoot Heater/Air Conditioner Blower Motor. An electrical motor is used to push air through the heater and air conditioner system. If this electric motor fails it will not force air through the system. Ground a test light lead to a good ground source, like a metal brace under the dash, seat mount bolt or under hood brace. Turn the key to the on position; check the fuse in the heater or blower motor fuse panel with a test light. Then lightly touch the service port at the top of the fuse on both sides. If the test light illuminates on both sides of the fuse, the fuse is ok and working properly. If the fuse lights the test light on one side it is blown and needs to be replaced. fuse_panel.jpg
    Power Distribution Center
    If you are unsure of the location of the heater fuse consult a repair manual. If the fuse condition is ok, position the blower speed to the highest setting. Connect the ground end of the test light to a known ground source. Then probe both ground and power feed wires of the fan motor. The test light should illuminate on only one of the wires (fan motor failed). If the test light illuminates on both wires the ground source has shorted. If neither of the wires illuminate the power source is shorted. To trouble shoot this style of problem a wiring schematic is needed.

Jan 12, 2011 | 2001 Chevrolet S-10

2 Answers

2005 GMC Sierra 1500 - heater blows, but only cold air


Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Jan 07, 2010 | 2005 GMC Sierra

2 Answers

No heat


use a blanket

Dec 15, 2009 | 2002 Oldsmobile Alero

3 Answers

No heat engine gets warm but heater wont switch from ac to heat


Start searching for a vacuum leak. The dash switch operates a vacuum assembly - but if the line is cracked, it "door" will not change position.

Oct 14, 2009 | Ford F-150 Cars & Trucks

1 Answer

2002 Land Rover ~ Freelander - No heat coming from the heater


Look for two water lines about 1 in in diameter running back toward the condensor unit in the firewall. On one of those lines will be a control. It is sometimes vacum controlled. When they are vacum conrolled they have a tendency to get stuck or you may have lost vacum to the unit. You can use a vacum tester and short piece of hose to test this to see if you have lost vacum or if it is stuck closed. Connect the test hose to the control on teh hose and apply vacum to the unit. If the valve opens you will get heat in the vehicle. If it does not open then it is stuck in the closed position and will need to be replaced in most cases.

Sep 10, 2009 | 2002 Land Rover Freelander

1 Answer

No heat only cold air blows. fuse not blown, ac works great


Hi

Check the heater coolant control valve.

Expect it´s stuck on closed position !

Good Luck !

Remember to give me a FixYa rating please !

Let me know how you get on.

John.

Feb 02, 2009 | 1998 Ford Expedition

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