Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

Heater


TAK79's Avatar
Visiting Guest

Posts: n/a

01-30-04, 06:45 AM   #1  
TAK79
Heater

I have a 98 Ford F-150 with a V8, and my heater isnt working properly. The blower works fine and there is no noises or anything. It does blow out kind of warm air when driving but when I stop the warm air then turns to cold air. Then back to kind of warm air when driving again. The engine runs at normal temperature and everything else seems to be allright. Any suggestions???

 
Sponsored Links
davo's Avatar
Member

Join Date: Apr 2002
Posts: 2,417

01-30-04, 03:20 PM   #2  
Make sure the coolant is full and flush the heater core.Sounds like low coolant or a blocked core.

 
Pendragon's Avatar
Member

Join Date: Jul 2002
Posts: 1,835
FL

01-31-04, 08:45 AM   #3  
Try this:
When you're stopped, rev the engine. If the air gets warm again, this is my guess..

Your dampers are vacuum controlled, and you've got a leak in one of the lines so that whenever you stop, there isn't enough vacuum to keep the damper pulled to the heat setting.

 
mike from nj's Avatar
Visiting Guest

Posts: n/a

01-31-04, 10:40 AM   #4  
mike from nj
quite the opposite pendragon.

at idle, the engine's vacuum is highest.

when you rev the engine, you are speeding up the coolant flow through the engine(from the water pump) and heater core too. if there is any air or a partially blocked heater core, this will help it out a little. back down to idle and the coolant slows down and the heat diminishes.

 
Search this Thread