Question about 2004 Audi A8

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2004 audi a8l with no interior heat. blower motor is working. coolant level is full, bled valves near firewall and still no heat. the line going into the solenoid valve is hot bu the line coming out is cold

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  • todd652 Dec 29, 2010

    the thermostat on an A8 is behind the timing chain and water pump, also I thought that if the thermostat failed I would not get heat to the intake line of the heater core. please advise

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Hello todd... Change the thermostat. This is an inexpensive part and easy to do yourself if you are so inclined. Here is a step by step video of how to change the thermostat. .. http://www.wonderhowto.com/topic/change-thermostat-in-audi-a4/
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Posted on Dec 29, 2010

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Hi, all things been equal with the blower motor working, full coolant level and all other things in perfect condition, then you have a bad thermostat that needs to be replaced immediately....

Posted on Dec 29, 2010

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2004 dodge intrepid 2.7l ......Heat works great while driving down the road but when stopped it blows cold?


The first thing you should do is make sure that you are not low in coolant as air can be introduced into the systemand cause circulation problems. If system is full, be sure that temperature gauge at normal operating temp is not fluctuating as there could be a thermostat problem. If that checks out okay, move onto check-in if the heater core may be plugged. To do this you must locate the 2 heater hoses that go into the firewall and feel the temperature of both of them with the heat turned on full. They sgould be around the same temp, if one is cold, that means the heater core is plugged up. Heater cores btw do not always need to be replaced if plugged, theu can be back flushed with pressurized water. Let me know if this helps good luck!

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Heater blows cold air only 2006 Dodge Charger?


Check all vacuum lines first for any possible leaks especially if you have a flow control near firewall or hoses going through firewall. If you feel hoses going to heater core, are they both hot to touch when engine at normal running temperature? Coolant level is up, and been bled properly? Did you have to add coolant lately for any reason?

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Heat and air condition fan stopped working on my 2004 Dodge Dakota, does not blow, ice is comming in and i need to be able to defrost my windshield and heat my truck


First thing to check is the fuse. There will be one under the hood and another in the interior fuse box. The 2004 model does nt have a relay. If the fuse is good, you need to check to see if the blower motor is good. The motor is located under the glove compartment area of the dash, near the firewall. Disconnect the harness from the blower motor, and using jumper wires, apply voltage directly to the blower motor contacts. If the blower motor works, then the switch is bad. If the blower still does not work then the motor is bad.

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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.

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1 Answer

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3 Answers

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THE KIDS WONT MIND THE COLD AS MUCH AS YOU! TRY CHECKING THE FLAPPER IN THE HEATER BOX UNDER THE DASH. IS THE FAN MOTOR BLOWING?

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2 Answers

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