Front Heating Question
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New User
Joined: Aug 2004
Posts: 9
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Front Heating Question
It's been a while since the last time I posted. I have a question. I have noticed that when I turn the heater on my 99' 5.4L, the rear seem to heat fine, but the front on blows cool air. There is no heat whatsoever even if I max the temperature. Anyone had similar problems with this?? What can be the possible cause?? Thanks in advance.
O.Hernandez
Brownsville, TX
O.Hernandez
Brownsville, TX
Elder User
Joined: Sep 2003
Posts: 753
Likes: 2
From: Oklahoma
This sounds like the famous blend door problem. If the blend door shaft is broken, it cannot control the amount air flowing thru the heater core.
Not sure if this is your problem, but it may be a start.
Good luck,
Tim
Not sure if this is your problem, but it may be a start.
Good luck,
Tim
Post Fiend
Joined: Apr 2004
Posts: 5,158
Likes: 35
From: North of Salt Lake City
Also be sure to check the coolant level. If there's not enough coolant, there will not be enough fluid to get to the heat exchanger. The hose that feeds the rear heat exchanger is lower than the front so that would explain why the rear heat works and the front does not. Just a thought.
Junior User
Joined: Oct 2003
Posts: 86
Likes: 0
From: North Carolina
If it is the blend door then you have a pretty tuff job ahead of you. I replaced mine in about 8 to 10 hours. But is something you can do yourself. Do a search for "blend door" and you will find helpfull information on diagnosis and repair. Good Luck.
Laughing Gas
Joined: Feb 2006
Posts: 843
Likes: 0
Check to make sure that the temp. control **** is not split where it pushes onto the shaft. It could also be a bad temp. control rotary control. This is checked with an ohm meter. If nothing else is could be a bad motor on the blend door. All of these are easier than the door itself and need to be checked before pulling the dash.
