2004 Chrysler Sebring Sebring blows hot at high RPMs, cold

Tiny
DBRUEN
  • MEMBER
  • 2004 CHRYSLER SEBRING
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 82,000 MILES
My 2004 Sebring convertible has a strange problem with the heater. When the thermostat knob on the dash is in the full-hot position, the heat blows full-hot when the car is moving at speeds around over 40mph. As the car slows, the air get cooler linear with the drop in speed. Then at a full stop it's blowing cool. When accelerating from a stop it does the same thing in reverse - the air gets gradually hotter as the car speeds up, and stays hot at full speed. The engine temp is normal throughout this cycle - the temp gauge reads between 1/4 - 1/2, and is not fluctuating at all. I called my Chrysler dealer, and they can't tell me what's wrong based on these symptoms. Any ideas would be appreciated. Thanks!
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Friday, October 31st, 2008 AT 9:02 AM

2 Replies

Tiny
MDYER18
  • MEMBER
I have the same car and have been having the same problem on and off for the last year. Check your antifreeze level.

I added some and the problem completely went away. I didn't notice it all summer until now. Only this year it was worse.

The problem is that I kept loosing coolant. I wrote it off a small leak (no big deal) until it took my thermostat. After having it checked I found out that the coolant resovoir had a crack in it. That's why I was loosing coolant. I recommend if you have any problem like that, fix it soon. The thermostat is cheap to buy to actually change it will cost you a lot of money or a lot of frustration. It isn't easy to get to.
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Wednesday, November 5th, 2008 AT 1:04 PM
Tiny
DBRUEN
  • MEMBER
You're right, this seems to have been the cause of the problem. I did check the coolant level when the problem cropped up, and it was within spec - but very close to the "low" line in the reservoir. I didn't have any of the proper coolant type on-hand, so I left it as it was. When I read your response, I picked up a bottle of coolant, and filled the reservoir to the "MAX" line (about 1/2 quart was added). The problem with the heat cleared up immediately. Interestingly, when I checked the coolant level again the next day, it had dropped back well below the max line. I jacked up the car and checked for leaks and found nothing. Right now, it seems like when the coolant level gets low in the reservoir, the actual level is lower than it indicates. I'm wondering now if the coolant level in the reservoir needs to be much higher than the "low" level in order for the cooling system to be able to pull fluid from it. Nevertheless, I'm happy that the issue seems to be resolved for now, unless there's a leak that I haven't been able to detect. I'll definitely be keeping an eye on it. Thanks again for sharing your experience with this problem!
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Monday, November 10th, 2008 AT 10:51 AM

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