You are here: Forums Sedans Chrysler 300M Chrysler 300M Overheating mystery

Chrysler 300M Overheating mystery

13 messages,  Last post on Jul 04, 2008 at 4:28 PM

You are in the Chrysler 300M Forum. Your Hosts are pat & karens

What is this discussion about? Chrysler 300M, Engine, Sedan

Messages Page 2 of 2 1 2 Prev Next Last

Go To Msg # Search This Discussion

#4 of 13 Re: 300M Overheating mystery [becaris] by tayl0rd Oct 16, 2006 (5:35 am)
Replying to: becaris (Oct 15, 2006 7:46 pm) That's some weird stuff happening. Maybe you have air in the cooling system? Take it to a shop and have them bleed the cooling system, or do it yourself.   Now that I think about it, air in the system seems to be the most logical problem. You say it happens every time you go uphill. That would indicate (to me) that an air bubble is traveling forward to the water pump, in which case the coolant isn't going to be pushed through efficiently, if at all. You also say it happens when you're traveling at highway speeds. Again, that would indicate air is getting to the pump. The inherent cavatation of the pump at those speeds only exacerbates the problem and brings coolant circulation to pretty much a trickle. When you slow down, the cavatation is reduced and coolant flows more efficiently.   In closing, just get the air out of the system and you'll be fine. Good luck! Replies to this message: becaris (Oct 16, 2006 9:02 am) tayl0rd (Oct 17, 2006 11:06 am)
#5 of 13 Re: 300M Overheating mystery [tayl0rd] by becaris Oct 16, 2006 (9:02 am)
Replying to: tayl0rd (Oct 16, 2006 5:35 am) Thanks for the suggestion, and I'll certainly take a look to make sure there is no air in the system. However, you would think that after the radiator and water pump were replaced by a mechanic that they would have gotten the air out of the system since they had to fill it again. It overheated before the change of water pump, and afterwards, with no improvement. Replies to this message: tayl0rd (Oct 17, 2006 11:06 am)
#6 of 13 Re: 300M Overheating mystery [becaris] by tayl0rd Oct 17, 2006 (11:06 am)
Replying to: becaris (Oct 16, 2006 9:02 am) They may have forgotten to bleed the air out. Another possibility is that you have a small crack in one of your radiator hoses. Has your coolant level remained the same?
#7 of 13 Re: 300M Overheating mystery [becaris] by brendalou22b Jan 31, 2007 (6:33 pm)
Replying to: becaris (Oct 14, 2006 8:27 am) Question...did you ever find out what caused this overheating? I have a 2002 300m and it is doing the same thing. We thought it might be the thermostat? the car is torn apart right now so if it is something else would you let me know??? Brenda
#8 of 13 300m overheating by rider62 Jun 06, 2007 (4:44 pm)
I have 1999 300m and it just started over heating. I rotated radiator flush in the system after it cooled down. I will began to drain after a days down time. Some things that I've noted is that the antifreeze was broken down and the last filler used prestone dex-cool with silicate. I am thinking that this may have cause slugging or just broke down the coolant's ability to perform. Q. Since I have opened a manual, although I do have some mechanical attitude, how to access the radiator drain plug and what bolts on the engine mount to remove to rock up the engine?
#9 of 13 300m overheating by rider62 Jun 06, 2007 (4:51 pm)
Q.1. Is it a good idea to cut into cooling system hoses to add a flush kit with the tee, like the one sold at auto stores?  2. Where is the easiest access to the radiator drain plug?  3. What bolts are to be removed to rock up the engine to replace the pulley compressor belts and serpentine belt?   thanks
#10 of 13 99' 300m overheating rider62 by rider62 Jul 26, 2007 (6:57 pm)
I found the problem, got it fixed. After I did the coolant flush, I started the car and notice one of two cooling fans not working. That also explains while the A/C didn't turn out cold air, nevertheless, I used a simple hand held diagnostic and it gave a code for "fan relay." They are located under the hood on the drivers side with the fuse box. Found blown fuse and the fuse was blown because of the fan motor seizing. Dual or combo fans cost about $300 new from MANUFACT. but I saw online for as little as $150. The labor is about $65-$70 hrly with about 2-2 1/2 hrs to do it right. Replies to this message: phaex11 (Jul 04, 2008 3:36 am) quietflyer (Jul 04, 2008 4:28 pm)
#11 of 13 Re: 300M Overheating mystery [becaris] by cmitchell18 Jun 22, 2008 (4:17 am)
Replying to: becaris (Oct 14, 2006 8:27 am) I have been having the same ongoing problem for a year and a half now. What ended up being the problem? I have changed the radiator, thermostate, therostat houseing, bleed the system, changed hoses and the reservoir....it feels like everything.
#12 of 13 Re: 99' 300m overheating rider62 [rider62] by phaex11 Jul 04, 2008 (3:36 am)
Replying to: rider62 (Jul 26, 2007 6:57 pm) My 99 300m did the same thing. It started with a loud vibrating noise coming from under the hood which was intermittent at first. Eventually the noise went away and the temperature was reading close to red. I parked the car and looked under the hood. The 40 amp hi / low fan fuses both were blown. I assumed one of the two fans siezed and blew the fuses. The A/C stopped working at that time also. I ordered a replacement fan from drautoparts.com which has an ebay store. I got the fans and shroud for $123.00 with shipping! UPS tracking shows I will receive it on 7/8/08. My local mechanic will install it for $100.00. Replies to this message: quietflyer (Jul 04, 2008 4:28 pm)
#13 of 13 Re: 99' 300m overheating rider62 [phaex11] by quietflyer Jul 04, 2008 (4:28 pm)
Replying to: phaex11 (Jul 04, 2008 3:36 am) I had the same problem a few years ago. The fuse for the fans also provides power to the A/C compressor clutch. They did not want the A/C to run with no fans. When you get the fans replaced and new fuses the A/C will work again.

Messages Page 2 of 2 1 2 Prev Next Last

Go To Msg # Search This Discussion

You are here: Forums Sedans Chrysler 300M Chrysler 300M Overheating mystery