Question about 2006 Scion tC

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The heating system does not work at any setting.

The heater fuse (under the hood) is good. The air conditioning works fine. The coolant level is good. The engine temperature gauge shows in the normal level and is working fine.

This problem surfaced abruptly, without prior indication. I suspect the issue may be electronic in nature because it occurred after I used an FM transmitter to supply to the radio sound system (GPS that was transmitting an audio book) just prior to the problem.

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  • Scion Master
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Scion says not to add any electronics to the car it will mess up the car, only factory parts

Posted on Nov 30, 2013

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Posted on Jan 02, 2017

01fordeb
  • 1033 Answers

SOURCE: no tail lights

You should have a fuse panel under you dash inside. This is where the fuses are located for lights. Don't know the exact location, but you can pull each fuse to see if it is bad. This won't hurt anything. It just keeps you from hunting down a diagram of where the fuse is located.

Posted on Apr 20, 2010

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My 2005 gmc seria heater will not blow hot air


There are a number of possibilities.
First, its the level of coolant in the radiator full?
Low coolant level will cause this, because the heater is higher than the engine, so air can rise to the heater and form an air-lock.
Second, is the thermostat good?
A thermostat that is stuck open will not make heat for the heater.
Third, the control valve may be stuck or broken, not allowing the hot water to flow to the heater core.
Usually these are vacuum operated, and usually found under the hood.
God bless your efforts.

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Is there a fuse or relay for the heater in my 2002 ford expedition


No hot air is due to low coolant, or even poor coolant flow. The engine heats up the coolant, and it passed through your heater core, and the heater blower motor pushes air through the heater core to warm up the air. If your "fan"is working, but the air is cold, make sure your coolant level is good.

Dec 08, 2011 | 2002 Ford Expedition

1 Answer

Y wont my heater get hot and my ac wont get cold?


Ok well every heating system and A/c system work very much the same...there are some troubleshooting Steps I would suggest...
First for the heating issue:
Step 1: Check Coolant level Low coolant can cause warm to cool air threw your heating system, not enough to fully heat...Caution: make sure the engine is cool when checking..You should have a tank that you can see the level..if not the top of the radiator is good.
Step 2: Any leaks in the coolant system, by just looking under the hood depending on the color, (Purple, Red, Orange, and Green) The system needs to obtain a certain Pressure to be effective..
Step 3: If all above checks ok...Assuming the blower motor is working correctly and good flow is present, there may be a vacuum leak or electronic divert-er malfunctioning( mixing cold and hot air thus getting warm air)
Step 4: Bring it to a shop, you may have a plugged heater core, an malfunctioning Thermostat, or an inefficient water pump...Hope this helps.

As for the A/c Not cooling...All cars that are 96 or newer must be charged with R-134a refrigerant...This can only be serviced by a shop that can deal with A/C recharging...could be low refrigerant, bad a/c clutch, bad compressor good luck hope this help

Nov 04, 2011 | Cars & Trucks

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

1 Answer

Heater stopped putting out heat, blower works fine air conditioning works fine


What you are saying is when you turn knob to hot you don't get any heat.? Let's start with the basics. Make sure your cooling system is filled up with coolant. Then with the engine warmedup and the temp gauge on the dash indicating between H and C. Find your heater hoses under the hood and feel them. Are they BOTH very warm or hot? os is only 1 warm and the other cool? If both are warm/hot, and still not getting heat from your vents. You have a problem with either the temp controller or the blends doors under the dash. usually the blend doors and it requires removal of the dashboard to get to it. If the heater hoses are wrm and cold then you may have a plugged heater core or water pump not circulating properly.

Jan 14, 2010 | 2000 Jeep Grand Cherokee

3 Answers

No heat is coming from the vents.The heater fan works normally. There does not appear to be heat recirculating through system. When in stop and go traffic the heat indicater gauge goes to hot. When the...


when the level of coolant drops in the motor the heater core is the first to be without
because it sets up high
so you need to check the level
and check where the coolant is going
to make the level drop

Dec 24, 2009 | 2004 Dodge Intrepid

2 Answers

Heat doesn't work all the time


Check the coolant level. If it is low, the heat won't work at idle, only when accelerating. If it gets even lower, it will overheat.

Dec 18, 2009 | 2004 Dodge Intrepid

2 Answers

Air conditioning works but not heat. blows out


At the radiator, drain and then flush with water then add 1 gallon of new antifreeze and top off with cool water. Now the cooling system will work.
If you have not performed routine maintenance on your cooling system - it will clog the heater in 10 years or less. Sometimes a bottle of radiator flush (purchased at any walmart or kmart) can clear the heater core - but you will have to run it with the heater on full heat setting for a few hours of driving.

Let us know!!

Oct 10, 2009 | 1999 Ford Taurus

1 Answer

Not getting any heat from my Automatic air conditioning and heating heating system


Could be a couple of things. The first thing that I would check would be the coolant level in the radiator, if that is low it can cause the heater not to blow hot air. The second thing I would find out is if the control to change from cold to hot is actually working? ( if it is a manual slider then the cable might have come off of the control behind the dash...if it is digital then there may be a wire off?) The third thing it might be is that your Heater Core went bad and will need to replaced. As I said above, I would check the coolant level first and go from there. Hope it helps!

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