2006 town car heater core?

Town

Senior Member
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Ottawa Ontario Canada
Not that I can see. What is your symptom/problem?

The service manual suggests that you check the hoses that attach to the heater core tubes since a leak there is "common" and allows coolant into the plenum giving the symptoms of a core leak (coolant smell in the car and misting of inside windshield when defroster activated).
 

Lewis Salvetta

Junior Member
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Wisconsin
Not that I can see. What is your symptom/problem?

The service manual suggests that you check the hoses that attach to the heater core tubes since a leak there is "common" and allows coolant into the plenum giving the symptoms of a core leak (coolant smell in the car and misting of inside windshield when defroster activated).
Temp gauge stayed at normal while idle. No heat. Then at 55mph gauge went up and heat came out for 30 seconds. Then heat went out and car over heated. Auto shop changed thermostat and water pump, let it idle for hours and it stayed normal. They left it in shop over night didn't detect leak. Next morning they drove on highway and said passenger floor was wet and passenger side window fogged. Car over heated.
 

Lewis Salvetta

Junior Member
45
0
6
Wisconsin
Temp gauge stayed at normal while idle. No heat. Then at 55mph gauge went up and heat came out for 30 seconds. Then heat went out and car over heated. Auto shop changed thermostat and water pump, let it idle for hours and it stayed normal. They left it in shop over night didn't detect leak. Next morning they drove on highway and said passenger floor was wet and passenger side window fogged. Car over heated.
Is it possible that if the heater core is clogged it will create so much pressure as to make it leak and possibly back flushing it, unclogging it will fix the problem without replacing the core?
______________________________
 

Town

Senior Member
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63
Ottawa Ontario Canada
Is it possible that if the heater core is clogged it will create so much pressure as to make it leak and possibly back flushing it, unclogging it will fix the problem without replacing the core?
Sounds like the core is leaking. A blocked core could be a problem in not allowing proper flow through engine and that would contribute to overheating. A blockage would compromise filling of cooling system.
 

Lewis Salvetta

Junior Member
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6
Wisconsin
Sounds like the core is leaking. A blocked core could be a problem in not allowing proper flow through engine and that would contribute to overheating. A blockage would compromise filling of cooling system.
Will unblocking possibly work, or is the only fix possible replacing the core itself
 

Town

Senior Member
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Ottawa Ontario Canada
Fixing a blockage will reduce possible pressure on the core and reduce a leak but not correct the leak. So you are likely going to have to replace the core unless the leak is caused by the poor hose connection identified earlier.

You can tell if there is a blockage by the temperature of the coolant in the heater hoses. The coolant flows from the rear right of intake (passenger side by cyl #4) to the heater core and then from the other core tube to a hose that runs down behind the intake and under the intake to the coolant pump. If you have an air lock in the head/manifold then the hose to the heater core will be cool and not hot. If you have an air lock or blockage in the heater core the input hose will be hot but not up to full temperature and the outlet hose to water pump will be cold. Any blockage in heater core will adversely affect engine coolant flow and could well cause overheating.
 

Town

Senior Member
4,399
129
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Ottawa Ontario Canada
If you want to replace the heater core yourself then I can get a tech article to help you. Basically, it involves removing the instrument panel (the entire dash) to remove the heater core housing which requires draining the cooling system and disconnecting the hoses. Then remove and replace the heater core and all the other parts.

The service manual says to pressure test the heater core before removal and also check the heater hoses at the core for leaks. The core is filled with water and a pump and gauge is connected to raise the pressure to 20 psi. If pressure drops in 3 minutes then the heater core needs to be removed for bench testing and replacement. You may be able to DIY the pressure test with an air pressure line limited to 20 psi. If the heater core holds the 20 psi pressure for more than 3 minutes then the problem is elsewhere.
 

Lewis Salvetta

Junior Member
45
0
6
Wisconsin
If you want to replace the heater core yourself then I can get a tech article to help you. Basically, it involves removing the instrument panel (the entire dash) to remove the heater core housing which requires draining the cooling system and disconnecting the hoses. Then remove and replace the heater core and all the other parts.

The service manual says to pressure test the heater core before removal and also check the heater hoses at the core for leaks. The core is filled with water and a pump and gauge is connected to raise the pressure to 20 psi. If pressure drops in 3 minutes then the heater core needs to be removed for bench testing and replacement. You may be able to DIY the pressure test with an air pressure line limited to 20 psi. If the heater core holds the 20 psi pressure for more than 3 minutes then the problem is elsewhere.
Thank you for your help. I have another problem now. The code says the transmission range sensor out of position. It's either defective or shorted or open circuit.
 

Town

Senior Member
4,399
129
63
Ottawa Ontario Canada
Thank you for your help. I have another problem now. The code says the transmission range sensor out of position. It's either defective or shorted or open circuit.
Better to ask a new question in the Town Car Forum. The TRS (transmission range sensor) is on the side of the trans that the shifter is attached to. It is bolted into place so unlikely to have loosened and shifted, but you never know. The TRS will tell the PCM what gear has been selected which affects drive-ability such as only allow start in P and N, turns on reversing lights in R. You should note any symptoms like these in your new thread in the Town Car forum here: Lincoln Town Car Forum (1981-2011)
 

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