Question about 2005 Ford F-150

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Heater is slow to come up to temperature

I need a diagram to show the water flow through the heater system and the valve that allows water to flow. This is on a 2001 F-150, 5.4 motor.

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The valve that allows water to flow is attached to the temp control switch on the dash. if the heater is slow to warm up, it could be your engine thermostat is stuck open.

Posted on Jan 12, 2009

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Vw polo 2005 1.6 trend not getting hot air in the cabin always blowing cold air no mater how long i have been driving.


the way any motor vehicles interior heater works is by allowing water from the engines cooling system to circulate through a mush smaller radiator located behind the dashboard and the fan blows air through the radiator allowing the warm water to heat the air so when you select warm or cold via the interior controls a valve fitted in line of the water pipes that is linking the engine bay radiator to the interior one allows water to flow which makes me believe that valve is not functioning

Jun 20, 2016 | Cars & Trucks

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Heat troubleshooting


<span>There are a few reasons this might happen to your system.<span> </span>A typical system is shown in the diagram below:<span> </span></span><br /><br /><br /><img src="CC87E1A.jpg" /><br /><br />The system requires hot water from the engine to pass through the heater core and the blend (or mix) door positioned for air pushed by the blower motor to pass through the core.<span> </span>If the <a href="/../cars/r6235876-no_heat_fan_blowing_cold_air#">vehicle</a> has no air conditioning, the evaporator is absent from the system.<span> </span>Some designs also incorporate a control valve in the heater hose to stop coolant flow to the heater core when not in use. The blend door position is actuated by a stepper motor or cable.<br />Typical failure modes are as follows:<br /><span><span>1.<span> </span></span></span>Blend door stuck<br /><span><span>2.<span> </span></span></span>Blend door actuator failed motor or stripped gears<br />3. Blend door cable is broke or needs adjustment<br /><span><span>4.<span> </span></span></span>Temperature control switch failed<br /><span><span>5.<span> </span></span></span>Air pockets in engine cooling system<br /><span><span>6.<span> </span></span></span>Clogged heater core<br /><span><span>7.<span> </span></span></span>Heater coolant control valve failed closed<br />8. Thermostat failed open<br /><br /><b>Troubleshooting:</b><br />First, with your engine hot and the heater turned on, feel the heater hoses in the engine compartment as they attach to the heater core at the firewall.<span> </span>If either of the hoses is cold, the problem is likely a lack of adequate coolant flow.<span> </span><br /><br /><b>No or low coolant flow:<span> </span></b><br />Check for the presence of a control valve in one of the heater hoses--trace the hoses all the way to the engine.<span> </span>Not all vehicles have such valves.<span> </span>If you find one, check to see if it is actuating properly.<span> </span>It should receive a signal of some kind from the heater controls and open when the temperature control is turned to heat.<span> </span>If you cannot determine that the valve is opening, try taking one of the clamps off and removing the hose to see inside the valve. A typical vacuum operated heater flow control valve is shown below:<br /><br /><img src="7FA590D.jpg" /> <br /><br />The valve may also be actuated by a solenoid or wire cable. <br />If you have no valve, next check the cooling system for air. If you have a radiator cap, take it off and look inside.<span> </span>If it is not full, fill it with coolant and start the engine.<span> </span>Turn the heater on and let the engine run until it is warm and the thermostat has opened.<span> </span>Continue to fill the radiator or reservoir until the level stops falling.<span> </span>Check for the presence of any bleed ports in the system.<span> </span>Bleed ports may be on the housings that radiator or heater hoses attach to or may be installed in the hoses themselves.<span> </span>A typical Honda application is shown below:<br /><br /><img src="C655B97.jpg" /><br /><br />For stubborn cases, p<span>ark the <a href="/../#">car</a> uphill, take cap off radiator, start <a href="/../cars/r6235876-no_heat_fan_blowing_cold_air#">car</a>, fill radiator, let it warm up until <a href="/../#">thermostat</a> opens, bleed air out, fill to the neck of the radiator and watch for bubbles coming up. Once you have bled the air, if gas continues to come out, you may have a blown head gasket that is forming bubbles that can block coolant from entering the heater. In these cases, the heater may work well at speed but blow cold at idle.</span><br /><br />Clogged core: If the control valve is open and there is no air in the system, your heater core may be clogged.<span> A quick way to check for a clogged core is to turn the blower motor off for a while and then back on. If it produces warm air for only a short time and then cools down, your core is only passing a small amount of coolant. This can also be caused by a bad control valve, if you car has one or possibly by a weak water pump. </span>You can try flushing the core by removing the heater hoses and attaching a garden hose or other source of water pressure to force water through the core.<span> </span>Use an adapter to make a good seal and connect to the lower pipe to backflush the core.<span> </span>If the core will not flush or allow adequate flow, replace the heater core.<br /><br />Thermostat: if your car temperature is running cold and only warms up when idling, the heater will do the same. This is caused by a thermostat that has failed open, allowing too much coolant to flow through the radiator. <span>.</span><br /><br /><b>Blend door not moving to heat position:</b><br />If you have coolant flow through the heater core, the problem is with the blend door.<span> </span>The blend door is almost always actuated from under the dashboard.<span> </span>Many systems use an electric motor to actuate the blend door.<span> </span>Check any heater or A/C fuses before tearing into your system.<span> </span>You may need to remove a partition to see the actuator.<span> </span>The door should be to the right of center under the dash.<span> </span>A typical electric motor actuator design is shown below.<br /><br /><img src="4ED4FC8.jpg" /> <br /><br />The actuator can be on the top front or bottom of the duct.<span> </span>Consult a manual for your vehicle if you cannot locate the actuator.<span> </span>Once you can see the actuator, watch it while you change the temperature setting (key on unless it is cable operated).<span> </span>If the actuator doesn't move or turn, troubleshoot the reason.<span> </span>Systems such as the one in the above picture typically fail in the shaft attach or the internal gears on the actuator.<span> </span>If your actuator is getting power but not moving the door, replace the actuator.<span> </span>If the actuator is not getting power, troubleshoot the control switch.<span> </span>Due to the wide variety of designs, we cannot provide test tips for electric blend door control switches.<br />Whether your blend door is electric or cable operated, remove the actuator and operate the door with your hand.<span> </span>If the door sticks, the heater box must be removed and opened to free the door and restore unhindered operation.<br />If your blend door is cable operated, check the cable for proper attachment at the control lever and at the door lever.<span> </span>The cable sheath must be properly adjusted and firmly clamped for proper operation.<span> </span>To adjust, first remove the cable from the door and move the door lever with your hand to observe the range of motion.<span> </span>Then set the control to full hot, open the door fully, and reattach the cable, clamping the sheath so as to ensure the door opens fully when set to hot.<br />

on Jan 31, 2011 | Dodge Caravan Cars & Trucks

1 Answer

Replace thermostat 03 explorer


Heater circuit of coolant system could be blocked by a trapped air bubble or a blockage in the heater core. Try having the heater core back flushed. Any good auto shop should be able to do this for you if you don't know how. To remove the trapped air bubble put a coolant flush valve in the heater core line that returns the flow to the water pump inlet. Connect a washing machine water hose to it then warm the car up, turn the heater temp control knob up to the max then open the flush valve on the heater return line to allow the air to be vented out--close the valve when the coolant flows out.(use caution he water blowing out of the hose will be hot. point it safely away into a bucket to catch the coolant) Check the thermostat for proper operation while you are at it so you know it is good. Put it in water on the stove and bring the water up to the thermostat set temp to see if it opens.

Dec 31, 2014 | 2003 Ford Explorer

2 Answers

The A/C is not cold enough but a gage shows the lines are full and the compressor is working. What else may I look for to ck.


The other item needed is the temperature at both the evaporator and the condenser. Check your chart but at X temperature, the pressure must be Y or refrigeration is not happening.
If the pressures are good, look for air distribution issues, like air doors and water valves.

Jul 08, 2014 | Pontiac Cars & Trucks

1 Answer

The heater is blowing cold air


heater control valve not allowing radiator water to flow through the heater core where the heater blower motor blows the heat that radiates off the heater core into the vehicle cheap fix or you can bypass yourself by replacing valve with piece of 3/4 copper pipe and 2 hose clamps

Jan 03, 2011 | 1998 Dodge Caravan

1 Answer

I am not getting heat all the time into my 1990 Maxima I flushed the system and replaced the engine themostate. Water flows threw the heater coil. What is next?


There are 2 thing is can think of right off the bat. Is the blower motor working? If your heater core and heater valve are working, is your duct valves working? They open and close using the car vacuum. When you shift your control to heat, you should hear the duct open or close. allowing only heat from the heater core. You may have a bad actuator valve or a leaking vacuum hose. That's all I can think of right now, hope this helps

Dec 29, 2010 | 1990 Nissan Maxima

2 Answers

Heater only blows Very luke warm air on low speeds. when the speed is increased to 3-5 the heat goes away and it only blows cold air. Any suggestions


Read all of these instructions before starting this job.
First test your heater core for flow by disconnecting both heater core hoses from motor and forcing air from an air compressor into one of them watching for flow from the other. If you have no flow then you may need to backflush your heater core - it is possible you have blockage in it. Your local auto parts store has a backflush kit you can buy that will have a backflush valve ( to be added to your supply heater core hose ) and an additive to put in your coolant system. The kit will not include new coolant so you will need to get that too. Install valve and connect a garden hose.Run motor specified time in the kit. Remove lower hose from your radiator and turn on the water from the hose full blast. Watch the coolant coming out from your radiator to see if any chunky stuff comes out - also watch for the color of the flow. Run water until it comes out clear, then shut off water and disconnect garden hose. Allow system to drain, reconnect radiator hose and cap flush valve. Refill coolant system, turn heat on high and run motor until it is warm. Top off coolant in radiator ( be careful - the pressure may cause coolant to spray out when you remove cap - put a rag over the cap before you remove slowly). If you do not have warm air at this point you may have a bubble in the heater core and may need to block rear wheels then raise the front of the vehicle until the radiator cap is higher than the heater core. Restart vehicle and turn heater on high . Check coolant level in radiator and top off, then cap radiator and shut off motor. Lower vehicle and start again with heater on high. If you still have no heat then your heater core may be plugged. To check, remove both heater hoses from motor and force air from an air compressor into one of the hoses, watching for flow from the other hose - if no flow then core is plugged and needs to be replaced, but if you have flow then you still have an air bubble in the system and need to purge using the above steps until you have heat.
Hope this helps and please rate my solution - good luck!!

Nov 29, 2010 | 2001 Chevrolet Silverado

1 Answer

My 1990 dodge caravan heater blows cold air instead of warm air. The coolant level is not low and the water pump is working well. Any ideas would be great.


There is a water valve on behind the motor close to the firewall. This valve is to stop the water flow while the A/C is in operation. It maybe bad and locked in close postion not allowing the water to get to the heater core.

Oct 14, 2009 | 1990 Dodge Caravan

3 Answers

I have changed the theromast twice and flushed the coolant system.The heater core is not leaking.. the blower is still blowing cool air.


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Jan 13, 2009 | 2003 Ford Expedition

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