Posted By: jonccjr
overheating hemi??? - 04/12/14 10:35 PM
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?
overheating hemi???
Posted By: johnmilner
Re: overheating hemi??? - 04/12/14 10:37 PM
electric fans????????????
Posted By: JonC
Re: overheating hemi??? - 04/13/14 02:24 AM
Welcome to Moparts. 
(I think I know this guy).
(I think I know this guy).
Posted By: jonccjr
Re: overheating hemi??? - 04/13/14 02:31 AM
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.
Posted By: JonC
Re: overheating hemi??? - 04/13/14 02:32 AM
Overheating at traffic lights? johnmilner might be on to something.
Posted By: RapidRobert
Re: overheating hemi??? - 04/13/14 03:58 AM
Quote:with it overheating that fast k.i.s.s. confirm that the fans are operating. Pull the stat & check it (Murphys law/coincidences happen)
they topped off the coolant and now i can't go five miles without it overheating.
Posted By: Challenger 1
Re: overheating hemi??? - 04/13/14 04:58 PM
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?
Posted By: jonccjr
Re: overheating hemi??? - 04/13/14 06:59 PM
thanks for the idea. I got two codes 0158,2181
Posted By: jonccjr
Re: overheating hemi??? - 04/13/14 07:24 PM
I actually ran it without a stat and it still overheated
Posted By: johnmilner
Re: overheating hemi??? - 04/13/14 09:21 PM
you didnt lose your belt did you?
Posted By: jonccjr
Re: overheating hemi??? - 04/13/14 09:29 PM
Belt is still present and seems to have enough tension.
Posted By: johnmilner
Re: overheating hemi??? - 04/13/14 09:32 PM
are the fans working with the ac off?
Posted By: jonccjr
Re: overheating hemi??? - 04/13/14 09:43 PM
I hate to ask but I have to. Do you mean the radiator fans?
Posted By: johnmilner
Re: overheating hemi??? - 04/14/14 12:50 AM
Quote:yes
I hate to ask but I have to. Do you mean the radiator fans?
Posted By: jonccjr
Re: overheating hemi??? - 04/14/14 02:40 AM
I never saw it running anytime I have been under the hood. Is there a way to check this?
Posted By: dynorad
Re: overheating hemi??? - 04/14/14 04:56 PM
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.
Posted By: Tom_440
Re: overheating hemi??? - 04/14/14 09:15 PM
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.
Posted By: Tom_440
Re: overheating hemi??? - 04/14/14 09:17 PM
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
Posted By: jonccjr
Re: overheating hemi??? - 04/15/14 12:36 AM
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.
Posted By: Challenger 1
Re: overheating hemi??? - 04/15/14 01:09 AM
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?
Posted By: RapidRobert
Re: overheating hemi??? - 04/15/14 01:56 AM
Quote:one of the jockeys may have jostled the fans or might just be Murphys law. An non mechanic acquaintance ran into this recently when he has something done & they hooked the fan wiring up backwards, evidently they are polarity sensitive & it was pushing or pulling the air the wrong way
The thing I don't understand is why this all occurred after I had the coolant topped off.
Posted By: jonccjr
Re: overheating hemi??? - 04/19/14 05:08 PM
Good call, you nailed it I just ran out of time. The wife took over and said get it to the shop.