Question about 1999 Chrysler 300M

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Hi I have a 1999 Chrysler 300m and every time it is 90 degrees or more it starts to over heat and now it blows cool air when I turn on the heater. What are your suggestions??? Thanks

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  1. check the coolant level in the radiator
  2. check the coolant level in the recovery bottle

Posted on Aug 27, 2010

  • nellie_malat Aug 27, 2010

    The coolant levels are ok.

  • james bierman Aug 27, 2010

    possible that the waterpump impellers have erroded not allowing suff coolant flow
    radiator maybe restricted

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Jan 27, 2016 | 2000 Chrysler 300M

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Heater not blowing enough heat


Check the thermostat and the water pump.

Feb 20, 2015 | 2004 Cadillac CTS

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Heater not blowing hot air


Sounds like the heater core

Mar 08, 2014 | 1999 Chrysler 300M

1 Answer

Heat blows cold 200 chrysler 300m


Hi Stacy,

There are several things that can cause that. Please read the article at the following link to get a better idea of what needs to be done.

Why Is My Heater Cold?

Dec 24, 2011 | 1999 Chrysler 300M

1 Answer

1999 Chrysler 300m heater won't get hot fan blows but doesn't heat


Is there enough anti-freeze in the system?
If so perhaps the system needs bleeding.
On the front of the engine, on top near the big upper hose goose neck and nestled between the runners of the intake manifold is a small nipple that looks like a brake bleeder (10MM). This is a cooling system bleeder, a close cousin to the brake bleeder. When opened it will purge the system of air- likely the culpret you are experiencing. on a cold or just warm engine, this can be slightly opened with a wrench and the air can be "Burped" out. Attach a 1/4" clear hose to the nipple and open the bleeder until you see all the air has left the manifold. (Run the hose into a bucket and dispose of the used anti-freeze properly.)
if that doesn't do it, maybe the thermostat is stuck in the open position. Replace it with a cold engine and use a new gasket each time.
If all else fails, the heater core may be plugged.

Nov 07, 2011 | 1999 Chrysler 300M

1 Answer

1999 chrysler 300m heater blowing only cold air. Need help to fix the problem


Kristi- please look for my proposed fix for this under another users question. If you need further help, let us know.THANKS!

Oct 09, 2011 | 1999 Chrysler 300M

1 Answer

1999 Chrysler 300M heater is blowing but no heat is coming out. Any ideas?


see if any one mess with it and did something that they should not have

Dec 28, 2010 | 1999 Chrysler 300M

1 Answer

300M WARMS UP TO NORMAL TEMP HEAT BLOWS HOT THEN AFTER ABOUT 10 MIN. ON EXPRESSWAY HEATER BLOWS COOL.I TURN TEMP UP TO 80 AND GET HEAT AGAIN.


this can be 2 problems the thermostat
or the module pcm that controls the digital controls on the dash panel
this is for the ac and the cluster if you change it you need to ask them to write your milles in it
i got one for a town and country and fix the ac problem anf it also give me 80k aditional miles

do the dance key test
you open and close the ignition key 3 times and the cluster will display error codes from the computer
with the codes we can solve this problem

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2 Answers

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try putting a piece of card in front of rad no more than 2/3 the rad area

Jan 12, 2010 | 1999 Chrysler 300M

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