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overheating hemi??? #1606389 04/12/14 06:35 PM 04/12/14 06:35 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	I have a 2005 dodge magnum r/t 5.7l hemi that is overheating. I verified today that my thermostat is good with the boiling water test, what should i test next and how?

Re: overheating hemi??? [Re: jonccjr] #1606390 04/12/14 06:37 PM 04/12/14 06:37 PM
Joined: Nov 2013 Posts: 97 Florida J johnmilner member
johnmilner member J Joined: Nov 2013 Posts: 97 Florida	electric fans????????????

Re: overheating hemi??? [Re: jonccjr] #1606391 04/12/14 10:24 PM 04/12/14 10:24 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC master
JonC master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	Welcome to Moparts. (I think I know this guy).

Re: overheating hemi??? [Re: johnmilner] #1606392 04/12/14 10:31 PM 04/12/14 10:31 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	so let me tell more of the story. I had this problem last fall, I changed the thermostat problem solved? well till yesterday it was. I went and had the oil changed, they topped off the coolant and now i can't go five miles without it overheating. It has two electric fans on the radiator.

Re: overheating hemi??? [Re: JonC] #1606393 04/12/14 10:32 PM 04/12/14 10:32 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC master
JonC master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	Overheating at traffic lights? johnmilner might be on to something.

Re: overheating hemi??? [Re: jonccjr] #1606394 04/12/14 11:58 PM 04/12/14 11:58 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: they topped off the coolant and now i can't go five miles without it overheating. with it overheating that fast k.i.s.s. confirm that the fans are operating. Pull the stat & check it (Murphys law/coincidences happen) live every 24 hour block of time like it's your last day on earth

Re: overheating hemi??? [Re: jonccjr] #1606395 04/13/14 12:58 PM 04/13/14 12:58 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: I have a 2005 dodge magnum r/t 5.7l hemi that is overheating. I verified today that my thermostat is good with the boiling water test, what should i test next and how? My guess would be a clogged radiator if you can hear the fans run. It happens a lot because the newer radiators have such small tubes in them now. Any codes?

Re: overheating hemi??? [Re: Challenger 1] #1606396 04/13/14 02:59 PM 04/13/14 02:59 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	thanks for the idea. I got two codes 0158,2181 Last edited by jonccjr; 04/13/14 03:19 PM.

Re: overheating hemi??? [Re: RapidRobert] #1606397 04/13/14 03:24 PM 04/13/14 03:24 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	I actually ran it without a stat and it still overheated

Re: overheating hemi??? [Re: jonccjr] #1606398 04/13/14 05:21 PM 04/13/14 05:21 PM
Joined: Nov 2013 Posts: 97 Florida J johnmilner member
johnmilner member J Joined: Nov 2013 Posts: 97 Florida	you didnt lose your belt did you?

Re: overheating hemi??? [Re: johnmilner] #1606399 04/13/14 05:29 PM 04/13/14 05:29 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	Belt is still present and seems to have enough tension.

Re: overheating hemi??? [Re: jonccjr] #1606400 04/13/14 05:32 PM 04/13/14 05:32 PM
Joined: Nov 2013 Posts: 97 Florida J johnmilner member
johnmilner member J Joined: Nov 2013 Posts: 97 Florida	are the fans working with the ac off?

Re: overheating hemi??? [Re: johnmilner] #1606401 04/13/14 05:43 PM 04/13/14 05:43 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	I hate to ask but I have to. Do you mean the radiator fans?

Re: overheating hemi??? [Re: jonccjr] #1606402 04/13/14 08:50 PM 04/13/14 08:50 PM
Joined: Nov 2013 Posts: 97 Florida J johnmilner member
johnmilner member J Joined: Nov 2013 Posts: 97 Florida	Quote: I hate to ask but I have to. Do you mean the radiator fans? yes

Re: overheating hemi??? [Re: johnmilner] #1606403 04/13/14 10:40 PM 04/13/14 10:40 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	I never saw it running anytime I have been under the hood. Is there a way to check this?

Re: overheating hemi??? [Re: jonccjr] #1606404 04/14/14 12:56 PM 04/14/14 12:56 PM
Joined: Jan 2003 Posts: 512 Niwot, CO Formerly denn... dynorad mopar
dynorad mopar Joined: Jan 2003 Posts: 512 Niwot, CO Formerly denn...	If your radiator is a 2 pass design the radiator can fail in a way as to bypass the tubes. Check to see if the radiator is hot everywhere.

Re: overheating hemi??? [Re: jonccjr] #1606405 04/14/14 05:15 PM 04/14/14 05:15 PM
Joined: Mar 2003 Posts: 5,137 Las Vegas, NV Tom_440 master
Tom_440 master Joined: Mar 2003 Posts: 5,137 Las Vegas, NV	I just changed the radiator in my 5.7 Magnum last month. Not expensive or terribly difficult. However, if you are overheating so quickly it does sound like the radiator fans not turning on.

Re: overheating hemi??? [Re: jonccjr] #1606406 04/14/14 05:17 PM 04/14/14 05:17 PM
Joined: Mar 2003 Posts: 5,137 Las Vegas, NV Tom_440 master
Tom_440 master Joined: Mar 2003 Posts: 5,137 Las Vegas, NV	Quote: I never saw it running anytime I have been under the hood. Is there a way to check this? Just look at the fans with the motor running. After the car is warm, the fans should kick on automatically to prevent overheating. P2181-COOLING SYSTEM PERFORMANCE P0158-o2 Sensor 2/2 Circuit High Last edited by Tom_440; 04/14/14 05:21 PM.

Re: overheating hemi??? [Re: Tom_440] #1606407 04/14/14 08:36 PM 04/14/14 08:36 PM
Joined: Oct 2013 Posts: 11 maine J jonccjr OP member
jonccjr OP member J Joined: Oct 2013 Posts: 11 maine	Turns out it was the fans. I have been so hung up on what seemed like a lack of fluid circulation. Cost me $200 for a new set and problem solved. The thing I don't understand is why this all occurred after I had the coolant topped off.

Re: overheating hemi??? [Re: jonccjr] #1606408 04/14/14 09:09 PM 04/14/14 09:09 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: Turns out it was the fans. I have been so hung up on what seemed like a lack of fluid circulation. Cost me $200 for a new set and problem solved. The thing I don't understand is why this all occurred after I had the coolant topped off. Thanks for letting us know how it turned out. Wonder if the coolant needing to be topped off was caused by the fans failure? In other words the fans failed first? Last edited by Challenger 1; 04/14/14 09:11 PM.

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