Old 01-30-04, 06:45 AM
Visiting Guest
Posts: n/a

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
Old 01-30-04, 03:20 PM
Join Date: Apr 2002
Location: Pittsburgh,Pa
Posts: 2,417
Received 0 Votes on 0 Posts
Make sure the coolant is full and flush the heater core.Sounds like low coolant or a blocked core.
Old 01-31-04, 08:45 AM
Pendragon's Avatar
Join Date: Jul 2002
Location: USA
Posts: 1,852
Received 2 Votes on 2 Posts
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.
Old 01-31-04, 10:40 AM
mike from nj
Visiting Guest
Posts: n/a
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.
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title: