My 2003 Lincoln Navigators heater stopped.

ANONYMOUS

MEMBER
2003 LINCOLN NAVIGATOR
135,000 MILES

My 2003 Lincoln Navigators heater stopped working. It's my understanding that there is a front and back heater core so I'm ruling out a heater core issue since there is not heat at either position/controls. I've checked the coolant level which is fine. The fan is working/blowing and produces only cool air. Any ideas of likely suspects? Thanks

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Blend door motor may be bad. is there any noise coming from behind the dash??
Usually if there is no heat and the temp gauge doesnt move it means no/low coolant.Check the coolant level again, it may have gotten low and now it has an air pocket in the engine. Do the heater hoses both get hot?

Roy

https://www.2carpros.com/articles/car-heater-not-working

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Tuesday, December 25th, 2012 AT 6:13 PM

2CP-ARCHIVES

MEMBER
4,540 POSTS
2000 LINCOLN NAVIGATOR
152,750 MILES

Took it in yesterday and had the radiator flushed. When I left the heat was not working. The front and rear were blowing but it was ice cold and the middle was not blowing out any air. All three were working fine before I the flush. Called them to and told them what was going on. On the phone they explained to le about air pockets. Took it back to them and they then said sometimes when a radiator is flushed it will knock things loose and can clog the heater core. They said they went ahead and flushed the heater core so the heat in front was working. They said the rear was still cold because has more then one heater core. When I left the second time the heat in front was working and continued working for about 10 minutes before blowing ice cold air again. Took it back to them today and asked why they didn't tell me before flushing the radiator that it could cause issues and he just got a smart attitude about it. What did they do to my Navigator?

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Tuesday, March 5th, 2019 AT 6:37 PM (Merged)

MHPAUTOS

MECHANIC
31,937 POSTS

I feel it still has an air lock in the system, cut your losses with this so called mechanic and get one that can bleed the system of air for you.

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Tuesday, March 5th, 2019 AT 6:37 PM (Merged)

2CP-ARCHIVES

MEMBER
4,540 POSTS
2001 LINCOLN NAVIGATOR
218,000 MILES

What is the procedure to flush the heater core?

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Tuesday, March 5th, 2019 AT 6:37 PM (Merged)

DRCRANKNWRENCH

MECHANIC
3,380 POSTS

To really flush it clean you can remove the 2 heater core hoses where they enter and exit the engine. The you can find the inlet by looking for the heater core valve near the firewall. Set the heat all the way to the hottest setting. Then put a graden hose up to the inlet hose and let it flush until clean water comes out of the outlet hose.