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Chrysler 300M Overheating mystery

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

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#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.

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