Question about 2001 Ford Expedition

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2001 expedition heater does not heat well

The heater for my 2001 Ford Expedition (4.6 engine, 2 wheel drive) blows some heat but not much. I just replaced the thermostat and notice that the replaced one was not stuck open (replaced it anyway). Problem still exists. Any ideas? Someone said that the temp gauge needs replacement; however, not sure where it is. Any ideas on any issues or route to tackle? thanks.....

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  • gmyles Jan 13, 2009

    The front heater and defroster does not heat at all.  It blows cold air so I know it's not the blower.  The back heater works fine.  I have a 2003 Expedition.

    Can anyone help?

  • artis Nov 11, 2012

    I had the same problem. I did an entire engine flush and now I have heat as if it came from factory. This is what I did for my expedition. What you will need is a flush tee kit, 2 bottles of lime-a-way, about 4 feet of hose. The first thing I did is disconnect the front heater core from the thermostat or intake. Its the hose coming from the heater going to the top of the expedition. This is the inlet hose to the heater. Also I cut the outlet hose going to the back of the motor. When you are finished you will need a straight pipe to reconnect the hose. If you have dual heater cores like I do, this will allow you to flush both the front and back systems at the same time. I connected a hose to the outlet (the one connected to the back of motor) and forced water in it and the water will come out the other hose most likely with rust and crude. I flushed it until it was throughly clean. The I reversed it. I did it twice both ways. DO NOT FORCE THE WATER IN THE HEATER CORE AT FULL STRENGHT. When I was finished flushing, i used my shop vac and wrapped my hands real tight around the hose and sucked out as much water as possible. I poured in lime-a-way and let it sit for 20 mins. Flushed it out by using the reverse flushing method from earlier except only do it the first way until it is clean. I did it one more time and again flushed it out throughly. Afterwards, I reconnected the hose to the top of the motor, and placed a connecting pipe on the rear hose coming from back of motor and reconnected the hoses. After that I started it up and my front heater core worked perfectly, but my back one was about 50%. If you have this problem, let the truck cool and then start second step. I went to the back and disconnected the heater core from the back of the truck (Dual cores) I started the truck for about 10 seconds to let rust water push out the hose. NO LONGER OR YOU WILL RUN OUT OF COOLANT. You do not need to remove the rear core. BEFORE REMOVING, MAKE SURE TO MARK WHICH HOSES IS CONNECTED TO WHICH END OF HEATER CORE. Remove the vehicles hoses from the heater core and connect a hose to the inlet and one to the outlet. Use a hose thats long enough to reach outside of the truck so you wont soak the interior. As you look at the core in the housing, The lower hose going into the heater core is the return line. This is where you will start the reverse flushing. Push water into this hose until clean. Mines again had rust coming out for a few seconds. I reversed the flow several times. Use moderate pressure, not too much, not too little. I used the shop vac to **** out the water from the lower hose after I was finished. Carefully pour lime-a-way into the upper hose until it flows out the lower hose. Hold the hose up so that the lime-a-way will stay in the core for about 20 mins. Flush out throughly, Add more lime-a-way and let soak another 15 minutes. Flush out again, make sure there is no lime-a-way left in the system. Reconnect the vehicles hoses to the heater core. Make sure to level off the coolant level to make sure it is where it needs to be. Start truck and let it warm up. When I tested mines to running temp it ran about 75% but once I drove the truck it heated up ridiculously hot. Now the truck is too hot at full strength. No matter because I can turn it down now. At least I have that option.



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I would flush the whole system with radiater flush then replace with new coolant. But make sure the heater is set to full heat when you flush it ( while driving around the block with flush in it) so the small radiater that has the hot water flowing through it gets flushed too. It may have some build up in it stopping the full flow of heated water/coolant through. If it is bad enough may need to remove and spray out the rubber hoses from the motor to the heater core, and possibly remove the heater core and hose it out to make it flow better and therefore increase the heating ability. Hope this helps.

Posted on Dec 31, 2008


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