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1999 Chrysler 300M Radiator Fans Not Working/AC
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ChevyAllTheWay
New User
Aug 21, 2010, 3:05 PM
Post #1 of 6
(8934 views)
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1999 Chrysler 300M Radiator Fans Not Working/AC
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1999 Chrysler
300M
3.5 H0
163,000 miles
Yesterday, I got out of my car after driving it and I heard a strange noise. We popped the hood and water and steam were spurting out of the coolant reservoir.
We waited for it to cool down, and attempted to drive it home. It did fine on the freeway, but as soon as we idled at a light, it quickly started overheating. As, I continued to drive it, trying to make it home, my temperature would get close to the red, and then quickly drop and it would repeat this process.
The AC also has stopped working. The radiator fans do not turn on. We tried replacing one of the fan relays but it didn't change anything.
What could this possibly be?
My check engine light is NOT on.
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Sidom
Veteran
/ Moderator
Aug 21, 2010, 10:13 PM
Post #2 of 6
(8925 views)
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Re: 1999 Chrysler 300M Radiator Fans Not Working/AC
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I think I see the problem here..... A Chevy guy is driving a Mopar  ..........No? ok it was just a guess....
The fans not coming on is definitely causing your problem. That system uses 2 relays, a low & high speed, which the PCM grounds to turn the fans on
The 1st thing you should so would be to manually power up the fans to see if the work. After that you need to check both relay sockets. 2 should have power, one feeds the fans and the other one is the one the pcm uses to ground the relay. If you have power on 2 legs, the fans are good then the problem would be for some reason the pcm isn't ground the relay and that would need to be traced down or you have 2 bad relays if the PCM is grounding the terminal....
I'm unable to post any info at this time so I can't post a wiring diagram for the system but suggest you get one and that will really help you trace this problem down....
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 22, 2010, 6:06 AM
Post #3 of 6
(8920 views)
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Re: 1999 Chrysler 300M Radiator Fans Not Working/AC
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Be sure to check the fuses at the top of the diagram
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Sidom
Veteran
/ Moderator
Aug 22, 2010, 3:37 PM
Post #4 of 6
(8915 views)
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Re: 1999 Chrysler 300M Radiator Fans Not Working/AC
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One picture is worth a 1000 words........ That pretty much says it all......
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somebody
New User
Aug 13, 2012, 4:22 AM
Post #5 of 6
(7053 views)
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Re: 1999 Chrysler 300M Radiator Fans Not Working/AC
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Hello,
I have the same car and the same problem:
• Chrysler 300M 1999 / 3.5
• Radiator fans and AC not working
Alternator is charging well.
Radiator fans are OK.
In fact, I got the problem in a small garage after the cooling has been changed. The guy did not find the problem but he wired the fans with a manual on / off switch inside the car in order I can go back home.
The 2 relays (hi & lo speed) seem to be OK.
The fuses are OK.
There are no OBD errors.
Engine temp gauge is OK.
Other things that don’t work:
• Horn
• Panel lightning if headlights are on
• Outside temp is wrong (zero)
• Battery light is ON
Please let me know how you solved the problem…
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 13, 2012, 4:51 AM
Post #6 of 6
(7048 views)
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Re: 1999 Chrysler 300M Radiator Fans Not Working/AC
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This question is 2 years old and belongs to someone else. Please start a new question of your own.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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