Jeepcom23 Posted December 27, 2009 Share Posted December 27, 2009 Yesterday, I used my MJ to haul two ATVs one in the bed, one on a trailer. I got on the Interstate and the light came on. I pulled over expecting the Overflow tank to be boiling...no and the E fan wasn't on (came on earlier that morning) All the Radiator hoses had pressure except the one coming off of the heater core. Added maybe 1/4 gallon to the radiator. Started off and it came on maybe 2 minutes before I got to my destination. Left my dest. and what was supposed to be a 15 minute drive turned into an hours worth (stopping and cooling) Let the truck cool down and took trailer (w/o my atv) and took it 5 minutes to my cousins house. On the way back The light came on. But the light was weird, it was kind of glowing on and off (everytime it came on) Had heat the entire time 91 4.0 HO 2wd. open cooling system. THANKS! -Cody Link to comment Share on other sites More sharing options...
Randy in Maine Posted December 27, 2009 Share Posted December 27, 2009 It almost sounds like you need to bleed the cooling system. You may very well have a bubble in there that is causing the light to come on. Then make sure the fan is getting power from the sender. Then confirm the coolant temperature with a thermometer. Link to comment Share on other sites More sharing options...
Pete M Posted December 27, 2009 Share Posted December 27, 2009 time to upgrade to a full instrument cluster. :thumbsup: Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 27, 2009 Author Share Posted December 27, 2009 time to upgrade to a full instrument cluster. :thumbsup: haha, tell me about it. and Randy, ill try that. I just checked my radiator cap and it will only hold around 8lbs. So I'm gonna get a new one of those as well. Link to comment Share on other sites More sharing options...
Automan2164 Posted December 27, 2009 Share Posted December 27, 2009 It didn't release anything into the coolant overflow? Rob L. Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 27, 2009 Author Share Posted December 27, 2009 It didn't release anything into the coolant overflow? Rob L. nope. Link to comment Share on other sites More sharing options...
Automan2164 Posted December 27, 2009 Share Posted December 27, 2009 Hmm... That makes me think it never overpowered the cap, but you should still replace it if its releasing early with a tester... Cheap insurance... Do you know if it was "actually" overheating, or could the idiot light just be messed up? Rob L. Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 28, 2009 Author Share Posted December 28, 2009 I honestly don't know if it was overheating, but I did already replace the rad cap. Link to comment Share on other sites More sharing options...
Pete M Posted December 28, 2009 Share Posted December 28, 2009 I honestly don't know if it was overheating, hence the need to replace that temp switch. and if you're going to do that, you might as well put that money towards gauges and the 2 sending units (oil and temp). :cheers: plus you can get a tach too! Link to comment Share on other sites More sharing options...
Automan2164 Posted December 28, 2009 Share Posted December 28, 2009 :agree: Don't replace, upgrade. Rob L. Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 28, 2009 Author Share Posted December 28, 2009 The temp switch? Where would that be located fine sirs? Link to comment Share on other sites More sharing options...
garyindiane Posted December 28, 2009 Share Posted December 28, 2009 Here is some good links: http://www.naxja.org/forum/showthread.php?t=921205 http://www.lunghd.com/Tech_Articles/Eng ... ostics.htm -Gary Link to comment Share on other sites More sharing options...
CWLONGSHOT Posted December 28, 2009 Share Posted December 28, 2009 Remember, just cause its new, doesn't remove it from suspicion...... I agree with others, "burp" your system. Not usually as big an issue on an HO like yours, but it sure sounds like it could be the problem. Besides its free and easy!!! Also whats your ''mix" in the rad? You mentioned adding water, was it from the tap, or distilled as it should be? How old is the anti-freeze? Might be time for a flush and fill. (An easier job, if done back in October as part of a reg maintaince interval) Good luck, CW Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 28, 2009 Author Share Posted December 28, 2009 Remember, just cause its new, doesn't remove it from suspicion...... I agree with others, "burp" your system. Not usually as big an issue on an HO like yours, but it sure sounds like it could be the problem. Besides its free and easy!!! Also whats your ''mix" in the rad? You mentioned adding water, was it from the tap, or distilled as it should be? How old is the anti-freeze? Might be time for a flush and fill. (An easier job, if done back in October as part of a reg maintaince interval) Good luck, CW I'm going to try that later today. The mix is probably 70a30w. And idk what kind of water it was. And I am probably going to take the heater core and radiator out and have them boiled and pressure tested. Link to comment Share on other sites More sharing options...
Randy in Maine Posted December 28, 2009 Share Posted December 28, 2009 A 50/50 mix works best for me. Too much A will also cause it to overheat. That puts me at about -34º F. Been here? http://www.gi.alaska.edu/ScienceForum/ASF6/680.html Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 28, 2009 Author Share Posted December 28, 2009 A 50/50 mix works best for me. Too much A will also cause it to overheat. That puts me at about -34º F. Been here? http://www.gi.alaska.edu/ScienceForum/ASF6/680.html Sorry I meant 30a70w It rarely gets below freezing here. Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 30, 2009 Author Share Posted December 30, 2009 Well, i Just replaced the temp switch and it still came on. Didnt have a multimeter to test the CTS, so I'm not sure yet. Anymore Ideas guys? Gotta buddy gonna bring an infrared thermometer from work and we are going to see if it is actually overheating. Link to comment Share on other sites More sharing options...
Pete M Posted December 31, 2009 Share Posted December 31, 2009 Gotta buddy gonna bring an infrared thermometer from work and we are going to see if it is actually overheating. ding-ding-ding! I went and bought one of the things myself cause they've proven to be so darn useful. :D You might learn a lot. Link to comment Share on other sites More sharing options...
Jeepcom23 Posted December 31, 2009 Author Share Posted December 31, 2009 Gotta buddy gonna bring an infrared thermometer from work and we are going to see if it is actually overheating. ding-ding-ding! I went and bought one of the things myself cause they've proven to be so darn useful. :D You might learn a lot. lol, hopefully ill be able to look at it either later or tomorrow. See if my radiator is doin its thing or not. Link to comment Share on other sites More sharing options...
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