99 lhs heater problems

My 99 LHS seems to have a heater problem. In the past 2 weeks it will
not always heat up in the morning. We can set the temp at 75 and up
with no response. It sometimes acts this way during the day as well.

Any ideas?

thanks
dave B.

 

Bad thermostat? Was radiator fluid recently changed? Could be an air
bubble was left in radiator.

 

My Concorde doesn't have the auto-temp controls, so I've not had this
problem. But 300M's have the ATC system, and there are frequently posts
on the 300M Club forums about the kind of problem you're having - almost
always a simple matter of re-cal'ing the ATC - here's how:
http://300mclub.org/forums/viewtopic.php?t=9163
Also read the second post in case that's your problem.


Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

 

....meaning the second post in that thread on the 300M CLub forums.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

 

--

Dave the first thing to check is the coolant level. If its low top it off.
Since you cant tell if there are any fault codes stored in any controllers,
start by having the vehicle at an ambient temp of 50 to 80 degrees. remove
m-1 (IOD) circuit fuse located under the hood in the PDC or disconnect the
battery for 10 minutes to erase any fault codes. reconnect battery or
install fuse, start the engine. Now the HVAC system will go into a
recalibrate mode. This may take up to about 5 min.
Now check to see if the system is working properly.

Glenn Beasley
Chrysler Tech

 

Coolant level ok, nothing has been changed since 8 months ago when I
replaced the raditator. My wife drives it most of the time, I drove it
this morning and noticed that with the temp up at 75 and outside air
53, the controls on Auto, that the interior fan was trying to run at
max. After awhile it started working and everything seemed to be
normal.

Glenn thanks for the info from you and Bill I will try what you both
suggested.
thank you
dave B.

 

You're welcome. I think re-setting will fix it.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')