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I have a 2000 ford expedition. what are the inner diameters of the heater hoses going thru the firewall

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The hoses don't go through the firewall, they connect to the pipes of the heater core under the cowl in the engine compartment. The size should be marked on the outside of the hoses.

Posted on Mar 18, 2011


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I have a 2001 Ford Expedition, Heater blows warm air whrn driving and cold air when sitting still

At your firewall there is a inlet and a outlet for coolant to go thru your heretofore it sounds like it's plugged take the hoses off at the firewall hook up a couple how's to the inlet and outlet a water source to the inlet force clean water thru the inlet dirty water should float out of the outlet hook your hoses back up run to temperature turn your heat on

Dec 10, 2016 | 2001 Ford Expedition

1 Answer

There are 4 hoses on my firewall, which two are the heater core

2 hoses are for the A/C evaporator core. These are heavier hoses with fittings on them. The heater core lines should be 5/8" rubber with hose clamps on them. Follow them back, they come from the engine.

Apr 07, 2013 | 2000 Ford Expedition

1 Answer

Where can i get a diagram printout of the heater core for a ford expedition so that i may see where on firewall it is located under dash?

follow heater hoses to firewall,the heater core is behind glove box area,could go tyo ford dealer for print out,or try looking up online,passengers side of vehicle.

Sep 02, 2011 | 1999 Ford Expedition

1 Answer

I have a 2000 ford expedition and the heater blows air just not hot air or even warm air.. weve already changed out the thermostat, heater core, heater control valve and it still isnt working.. what could...

Check the vacuum hoses from the switch to the engine compartment. If you manually operate the heater valve on the firewall (follow the 5/8" hose) you will get heat.

Feb 08, 2011 | 2000 Ford Expedition

1 Answer

Blend door works properly only thing i cant find is a control valve in is climet control i thought maybe ac staying on no that not it i out of ideas i need help

FOLLOW 2 hoses that go thru the firewall ..the heater control valve should be near the heater core...2 vacuum lines attached too

Jan 24, 2011 | 1998 Ford Expedition

2 Answers

What can cause my heat not to get hot in my 2000 ford expedition? the heat does blow but it blows only cold air.

Feel both your heater hose near the firewall. If one is colder than the other your heater core is bad.
If they are both hot its in the cab controls. Lee

Jan 05, 2011 | 1998 Ford Expedition

1 Answer


check that the coolant level and the thermostat are both correct.
check the two hoses going into the heater core at the firewall that they are hot.
If the hoses are hot,it is also possible that the actuator is staying closed,creating a no heat situation.
the heater core itself could also be plugged,and needs replacement.

Jan 12, 2010 | 2000 Ford Expedition

2 Answers

2001 ford expedition only blows hot air and when fan is off it keeps drivers feet hot

Hi under the hood the hoses going into the fire wall from the engine on one of the hose you have a valve which is open and close by a solenoid when it's defective it stays open check and close the valve

Sep 09, 2009 | 2000 Ford Expedition

1 Answer

Where is the heater core hose in my 2000 ford expedition?

check closer to just underneath the firewall--it could be a smaller problem than a heater core--Ford 4.6--5.4 engines have a tube just underneath the intake manifold that the rubber hose goes bad and it will leak towards the back of the engine.Lets hope so-what i hear its very expensive to change a heater core in an Expedition.

May 01, 2009 | 2000 Ford Expedition

2 Answers

Diagram bypass heater cord on 2001 ford expedition eddie bauer

the heater bypass is quite simple, if you look at the firewall you will see two medium sized coolant lines, remove them from the firewall and link them together using a proper sized tube, you can purchase a kit at a parts store quite cheaply

Sep 12, 2008 | 2001 Ford Expedition

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