Question about 1999 Chrysler 300M

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We have a 1999 Chrysler 300 M we have good ac blower works fine just no heat we have flushed all systems refilled with coolant changed water pump changed radiator cap changed thermostat still no heat all levers under dash work fine even the heater core we even tried flushing it and it works fine still no heat help

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  • perpetually
    perpetually May 11, 2010

    Even though you have already checked it, sounds like your heater core is the culprit in one way or another. Have you bleed ALL air from the system? It is common for air to get trapped in the heater core.

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  • Master
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Check valve at and before fire wall penetration should be in line with heater hose 

Posted on Oct 04, 2009

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SOURCE: We have a 1999 Chrysler 300 M we have good ac

Laura, it sould like a valiant effort so far.
Have you burped the system?
There could be a big air bubble in the heater core that will not allow any anti-freeze to flow through.
Never try to pick a car up over the shoulder and attempt to burp it. :) Instead take a 10MM socket on a long extension ratchet and do this: Open the hood and stand right in the middle in front of the engine. Look in and downward to about the first arm of the injector plenum. That's the big, flat black piece of plastic on the engine with six arms sticking out to the left and right side on top of your engine. Look carefully downward and look for a little nipple sticking out just to the right of center on the top-front on that area. As a guide, follow the top hose from the radiator to the aluminum manifold. Look carefully and you can see it looking back at you. Stick the 10MM socket onto it and turn it COUNTER CLOCKWISE to break it loose. Once loose, either air, or anti-freeze or air AND anti-freeze will come out. To avoid a mess plug in a 1/4" clear hose to it and stick the hose into a bucket. Start the car and watch the air and liquid come out. When it runs clear without any air, give the hose a light twist CLOCKWISE to close it up. Tighten with a wrench. In this process make sure you don't get burned from the anti-freeze or make a big mess on the driveway. Dispose of the used Anti-Freeze properly. and GO!

Posted on Dec 01, 2011

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We have a 1999 Chrysler 300 M we have good ac blower works fine just no heat we have flushed all systems refilled with coolant changed water pump changed radiator cap changed thermostat still no


Laura, it sould like a valiant effort so far.
Have you burped the system?
There could be a big air bubble in the heater core that will not allow any anti-freeze to flow through.
Never try to pick a car up over the shoulder and attempt to burp it. :) Instead take a 10MM socket on a long extension ratchet and do this: Open the hood and stand right in the middle in front of the engine. Look in and downward to about the first arm of the injector plenum. That's the big, flat black piece of plastic on the engine with six arms sticking out to the left and right side on top of your engine. Look carefully downward and look for a little nipple sticking out just to the right of center on the top-front on that area. As a guide, follow the top hose from the radiator to the aluminum manifold. Look carefully and you can see it looking back at you. Stick the 10MM socket onto it and turn it COUNTER CLOCKWISE to break it loose. Once loose, either air, or anti-freeze or air AND anti-freeze will come out. To avoid a mess plug in a 1/4" clear hose to it and stick the hose into a bucket. Start the car and watch the air and liquid come out. When it runs clear without any air, give the hose a light twist CLOCKWISE to close it up. Tighten with a wrench. In this process make sure you don't get burned from the anti-freeze or make a big mess on the driveway. Dispose of the used Anti-Freeze properly. and GO!

Nov 07, 2011 | 1999 Chrysler 300M

1 Answer

My 1999 cougar is over heating i have changed the thermostat and the radiator already and the water pump is good but the car is still over heating should i get a coolant flush to see if that clears it up...


Why would you even think about a coolant flush?

You have a new radiator, so all that is left is the heater core
That isn't your problem

You lost all the coolant when you did the radiator & thermostat
So what is there to flush ?

No bottle of doctor do good will fix your issues

Diagnose the main cause

How do you know the water pump is good?
Was it in your hand and still had an impeller that wasn't eaten away?
Was it pumping coolant and the system built up pressure that you
actually tested

Have you tested for combustion gases in case the head gasket is gone?

Sep 22, 2011 | 1999 Mercury Cougar

2 Answers

HAVE FLUSHED THE SYSTEM AND INSTALLED A NEW THERMOSTAT. BLOWER WORKS FINE BUT VERY LITTLE HEAT. COOLANT LEVEL APPROPRIATE.


check water pump working and no leaks..might be vacuum line not opening the flapper door or heater core, or heater control valve

Jan 20, 2011 | 1989 Buick Century

2 Answers

Heater is running but no heat is coming out....could it be as simple as a fuse or do we need to take the car in?


If it is blowing air then it is not a fuse or your blower motor. It is your heater core is clogged or gone bad. Unless you know how to replace it you may want to take it to a shop.

Dec 06, 2010 | 1999 Chrysler Concorde

1 Answer

I have a 2000 chryler concorde with no heat. I changed the thermostat.I 've checked the coolant. The blower is working but only cold air. Any solutions


if you have changed the thermostat. did you bleed air out of system, if air is trapped in system it will not heat right! drain radiator and flush it good, but when refilling turn heater on high heat. then bleed air out when refilling system. most all cars have a bleeder for air. if in doubt, call any auto parts store to find out where yours is. if air is in system you will see bubbles appear from bleeder. also when flushing engine, make sure you start vehicle so it circulates through engine as well as refilling system. if the upper radiator hose gets hot then check for heat from car if it is ok! close bleeder and make sure radiator is full. I think the biggest culprit is air trapped in system. before starting the flush, be sure its not caused by low coolant in radiator. have a good day!!

Nov 05, 2010 | 2000 Chrysler Concorde

1 Answer

Over heating, even when thermostat and water pump has been changed.


Check for the proper operation of the cooling sans.
Check the drive belt on the water pump.
You may need to reverse flush your raadiator.
Some cars require bleeding the air out of the system whrn you refill it with coolant.

Good Luck

Oct 13, 2010 | 1995 Buick Regal

1 Answer

04 sebring 2.7L V6, not hot air from heater at idle, only heats up after about 1500 RPM...engine does not seem like its overheating... ???


check your coolant level and make sure its bled. if its full the next thing to do is to flush the system and with a flush chemical(any autoparts store about $10). refill with fresh coolant and distilled water and make sure system is bled by turning on the heat while refilling the system.cheers

Jan 07, 2010 | 2004 Chrysler Sebring

2 Answers

What are some things that would cause no heat


switch malfunction,blower not working,heating element burnt out.

Dec 07, 2009 | 2001 Chevrolet Blazer

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