Go Back   DodgeForum.com > Dodge Trucks > Dodge Ram > 3rd Gen Ram Tech
Sign in using an external account
Register Forgot Password?


3rd Gen Ram Tech 2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

2002 1500 5.9L - Overheating

Reply
 
 
 
 
Thread Tools Search this Thread
  #1  
Old 06-08-2010, 03:57 PM
amcgove amcgove is offline
Registered User
2002 Dodge Ram 1500
 
Join Date: Jun 2010
Posts: 4
Question 2002 1500 5.9L - Overheating

Hey Everyone,

I have a 2002 1500 5.9L that just recently started to overheat. I have replaced the thermostat and flushed the coolant. Last year the water pump was replaced.

When I start it up and let it Idle it can run for 2+ hours and not over heat but after about 10-15 min driving around the city or about 40 min on the highway it starts to climb above normal. In the first 5 min it will get up to normal then it appears the thermostat opens and the temp drops about a 1/8th inch on the gauge then slowly climes back to normal and keeps climbing. It never makes it to the red since I generally turn on the heater to bring it back to normal. I had the trans flushed and differentials.

I was going to check the fan clutch or sensor, but I need to do a little research on these two since I am not an expert on engines. Is there anything else that people have run into that I should be considering?

On an unrelated topic I have read some posts about oil sludge building up in the 2002 trucks and causing the engine to fail. Is that just with the 4.7L or do I also have to worry about that with my 5.9L?

Thanks
Drew
This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!
Reply With Quote
  #2  
Old 06-08-2010, 04:07 PM
nim81's Avatar
nim81 nim81 is offline
Record Breaker
2002 Dodge Ram 1500
 
Join Date: Nov 2006
Vehicle: 06 TRX4 QC HEMI
Location: fredericktown
Posts: 2,400
Default

ok, the 5.9 is pretty simple, cooling wise. from what im hearing here it sounds like you have a faulty thermostat. it could be possible you put the thermostat in the wrong way.... if your fan clutch was bad, the fan would be engaged all the time constantly pulling air. you may also want to check the waterpump pully for play as they tend to not last very long , especially if you got a cheapy valuecraft unit. a bad fan clutch can cause a waterpump to go south quickly
when you flushed the coolant, did you flush the heater core? could be some gunk in there causing problems, not common but ive seen it happen.
to check the fan clutch let the motor cool to ambiant temp. and see if you can spin the fan blade, if not your clutch is siezed.

a popular mod for alot of people on here is to switch out the clutch fan for an e-fan. fyi.

havnt heard any sludge issues with the 5.9, though the biggest problem with this motor is the plenum gasket. search the 2nd gen ram forum for that and a plethora of info can be found on that problem.

also, welcome to DF!
__________________
Listen.. I would never hit you with an axe.. when you had skewers stabbed through your mouth. I would figure one or the other would be enough..
5.9L truck club founder (retired)

Last edited by nim81; 06-08-2010 at 04:12 PM..
Reply With Quote
  #3  
Old 06-08-2010, 06:02 PM
MikeHTally's Avatar
MikeHTally MikeHTally is offline
Champion
2006 Chrysler 300
My Garage
 
Join Date: Aug 2007
Vehicle: 2003 1500 QCSB Hemi 4x2
Location: N. Florida
Posts: 4,398
Default

Sounds like the 'stat to me too. Mine did a very similar thing. It would climb and then drop back. I put in a 180 and that took care of it.
__________________
2003 1500 QC Hemi

2006 Chrysler 300C
2008 1/2 Mazda Speed3
Reply With Quote
  #4  
Old 06-08-2010, 10:05 PM
SteveR SteveR is offline
Professional
Garage is empty, add now
 
Join Date: Jan 2009
Vehicle: 1991 B250 318 Roadtrek
Location: Ontario
Posts: 175
Default

Feel all over the radiator after the truck is hot. I could touch about 95% of my rad bare handed when my rad was clogged and only about 5% was screaming hot. Flushing radiators doesn't work in my experience so replace it if it's plugged.

Steve
Reply With Quote
  #5  
Old 06-08-2010, 11:25 PM
Ethan_05_24's Avatar
Ethan_05_24 Ethan_05_24 is offline
Veteran
2007 Dodge Ram 1500
 
Join Date: Apr 2010
Vehicle: 2007 Ram SLT 4.7
Location: Havabean, Tx
Posts: 352
Default

i had the same problem in my old 1999 5.9L Durango, i replaced the thermostat, flushed the radiator and nothing worked...then i realized that my water pump needed to be replaced. fixed it instantly and never had that problem again...then i sold it and got my Ram so idk how it is now but i had it about 4 months after replacement and selling it so that may work for you.
__________________

SI/DO FlowMaster 50; SuperChips Cortex; PutCo Nitro Blue bulbs;
K&N 57-1529; 87 Octane Tune; Blue LED's under dash; McGaughy's 2" drop shackles; O/L Leaf delete
Reply With Quote
  #6  
Old 06-08-2010, 11:26 PM
nh5 nh5 is offline
Veteran
Garage is empty, add now
 
Join Date: Oct 2008
Vehicle: 2002 Ram 1500 QC Sport
Location: Long Island, NY
Posts: 254
Send a message via AIM to nh5
Default

I'd say check the thermostat double check its in the right way. I think it doesn't sit right when its upside down anyways. Then feel the radiator good chance you might have a clog somewhere.
__________________
02 Ram 1500 QC Sport 5.9L Magnum, Magnaflow 12576, SRT Hood, 180deg Stat, Superchips 3815, CAI, Hughes Plenum Fix.
Soon 1.7rr's, cutout, shift kit, headers, 52mm tb etc.
Black Truck Club Member #003
Reply With Quote
  #7  
Old 06-09-2010, 02:46 AM
cmzracing's Avatar
cmzracing cmzracing is offline
Rookie
Garage is empty, add now
 
Join Date: Aug 2007
Vehicle: 2006 Hemi 1500 QC
Location: Honolulu, HI
Posts: 55
Default

Quote:
Originally Posted by amcgove View Post
Hey Everyone,

I have a 2002 1500 5.9L that just recently started to overheat. I have replaced the thermostat and flushed the coolant. Last year the water pump was replaced.

ok, with that said, 1st question, did you replace the thermostat and flush the coolant after it started to overheat or did you do a regular maintenance with new coolant and thermostat, then it just started to overheat?
__________________
2006 Hemi QC

Last edited by cmzracing; 06-09-2010 at 02:49 AM..
Reply With Quote
  #8  
Old 07-13-2010, 01:31 PM
amcgove amcgove is offline
Registered User
2002 Dodge Ram 1500
 
Join Date: Jun 2010
Posts: 4
Default

Thanks for all of the responses!

I had replaced the thermostat and flushed the coolant after I was having the overheat problem not as general maintenance.

I ended up replacing the fan clutch (I had ordered it prior to the first response). For the last couple weeks I thought that solved the problem, while I drive around the city it stays right at normal temp. This past weekend I went out of town and noticed that after driving on the highway for 15-20 min when I would slow down to a stop light it would start to to heat up when I would take off it would drop back to normal. After about an hour on the road it would run just above normal. It would never run hotter than halfway between normal and the top end of the gauge (approx 1 cm right of normal).

On the way home I ended up towing a buddies boat, had the AC running, and it was 85 degrees. It started out normal, dropped a half a cm, then slowly climbed to about 1 cm past normal and stopped climbing.

I checked the thermostat, it is not upside down and I have it in the 12 o'clock position. I bled the air out of the system. I have not felt the radiator to see if that is plugged, that is a good idea. If all of the radiator feels hot then it must be the water pump? I was hoping that it wasn't since it was just changed out last year.

Thanks
Reply With Quote
  #9  
Old 07-26-2010, 10:20 PM
amcgove amcgove is offline
Registered User
2002 Dodge Ram 1500
 
Join Date: Jun 2010
Posts: 4
Default

I felt both the upper and lower radiator hoses and they are both hot to the touch so I assume the thermostat is functioning properly. I felt the radiator and it was too hot to touch on the top and I could hold my hand on the bottom without removing it. I am going to swap out the radiator tomorrow.

I noticed the transmission cooler is pretty dinged up with little stones (MN winters) and bugs, I was wondering if I should also replace this due since it may be restricting some airflow. What do you think?

Thanks
Reply With Quote
  #10  
Old 07-28-2010, 05:44 PM
amcgove amcgove is offline
Registered User
2002 Dodge Ram 1500
 
Join Date: Jun 2010
Posts: 4
Default

Just wanted to update the situation. I replaced the radiator and gave the heater core a good flush. The problem is solved, it hit 97 degrees with high humidity and it did not overheat at all. I drove stop and go in the city, was on the interstate, and sat in some rush hour traffic with the AC on.

Thanks for all the advice, it feels good to have this fixed.
Reply With Quote
Old 07-28-2010, 05:44 PM
 
 
 
Reply




Tags
fan clutch, overheat, radiator, thermostat, transmission cooler

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join DodgeForum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -4. The time now is 07:04 AM.

Internet Brands, Inc.


Contact Details & Emails