Chrysler 200 & Sebring Whether it be the sedan, coupe, or convertible, this mid-sized model offers a touch of class to every style in it's lineup

heater blows cold at idle

Old 10-06-2008, 05:49 AM
Thread Starter
Join Date: Oct 2008
Posts: 1
Default heater blows cold at idle

99 sebring's heater is not working right, get some heat when moving, goes cool when idle. I replaced thermostat and antifreeze, and flushed the heater core. Water pump was replaced last year. Could there be air in the system, if so how do you bleed it out.

Old 10-06-2008, 10:48 PM
dcotter0579's Avatar
Senior Member
Join Date: May 2008
Location: Detroit suburb
Posts: 4,993
Default RE: heater blows cold at idle

Driving the car should drive the air out of the system provided that your radiator cap is working properly. It may take several warm-up and cool-down cycles to accomplish that. Refill the system.

Feel the hoses leading to the heater core. If they are both warm, with one slightly less warm, that's good. If one is warm and the other not, then there's a blockage somewhere.
Old 10-07-2008, 03:44 PM
Senior Member
Join Date: Apr 2008
Location: Northern California
Posts: 278
Default RE: heater blows cold at idle

It can also be a water pump issue, flowing sufficiently only at cruise RPM.

Do you notice any temp gauge issues at all? Fluctuation, inoperable, or even mild overheating?
Have you checked all of your hoses for resiliency? Collapsed hoses do weird things sometimes, but most of the time they just burst.

It does sound like air though, especially if there are no other symptoms. A radiator cap is an inexpensive possible solution.

One other thing to check: (Heaven Forbid!) Look for air bubbles in the radiator with the cap off while idling. Head gaskets and cracks can let compressed air into the system from the cylinders.
Old 10-08-2008, 11:44 PM
Senior Member
Join Date: Jun 2007
Posts: 120
Default RE: heater blows cold at idle

Check the level at the filler neck when it's cool. It should be right under the cap. If it isn't, then you've either got a leak between the overflow tank and the filler neck allowing air back in rather than coolant, a bad cap with or without corrosion on the filler neck or leaking freeze plugs.

Related Topics
Thread Starter
Last Post
Chrysler Voyager & Town & Country
08-31-2013 10:03 AM
Chrysler PT Cruiser
01-28-2011 07:21 PM
300M, Concorde, LHS, New Yorker
08-25-2010 12:20 PM
Chrysler Voyager & Town & Country
06-20-2010 04:30 AM
Chrysler Voyager & Town & Country
01-07-2010 08:04 PM

Thread Tools
Search this Thread
Quick Reply: heater blows cold at idle

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.