Dismiss Notice



Register Today It's free! This box will disappear once registered!

Cant Figure Out Overheating

Discussion in 'Stock 1991 - 1994 Explorers' started by dudefromflorida, June 30, 2011.

  • Searches ExplorerForum.com
    1. dudefromflorida

      dudefromflorida Member

      Joined:
      March 27, 2009
      Messages:
      60
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Fuquay Varina, NC
      Year, Model & Trim Level:
      '94 Sport
      Latley my Ex has not liked to idle. I can run it all day in the heat at highway speeds and around town with no problem. When I idle and sometimes in traffic it tires to overheat. Sometimes at idle it will take 2 min to overheat, others it will not overheat for 10 min if at all. I have replaced the thermostat, flushed the system, and new radiator cap. Yet still it overheats. Any other ideas or anything I am missing? Could it be the fan clutch? Im lost.
       
    2. Support EF

      Join the Elite Explorers for $20

      Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.


      to hide adverts.
    3. mr cribb

      mr cribb US Army Retired Elite Explorer

      Joined:
      December 16, 2010
      Messages:
      2,305
      Likes Received:
      38
      Trophy Points:
      68
      City, State:
      Harviell, MO
      Year, Model & Trim Level:
      94 Chevy Z71, 93 X EB
      Quite possibly the fan clutch. I believe another member had or was having similar issues and it was mentioned in town overheating was most likely linked to the fan clutch.

      I'd also check your fan blades, as most 1st gens are cracked. If you were going to replace the fan clutch might as well replace the fan blades as well since the two items are attached, unless you have recently put a new fan on it.
       
    4. mr cribb

      mr cribb US Army Retired Elite Explorer

      Joined:
      December 16, 2010
      Messages:
      2,305
      Likes Received:
      38
      Trophy Points:
      68
      City, State:
      Harviell, MO
      Year, Model & Trim Level:
      94 Chevy Z71, 93 X EB
      I see your town listing in NC.... I traveled through there on my way to Raleigh several times. I just left Bragg a few months ago.
       
    5. Delta_1980

      Delta_1980 Member

      Joined:
      September 6, 2008
      Messages:
      54
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      livingsville, California
      Year, Model & Trim Level:
      92' exploder
      your radiator cap could have failed and wont hold the pressure in the system while your moving slowly around town. no visible leaks but venting pressure and lowering boiling point. its worth a try.
       
    6. Patened

      Patened New Member

      Joined:
      April 4, 2011
      Messages:
      31
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      prdebevec@gmail.com
      Year, Model & Trim Level:
      91 XLT
      i was having the same problem.

      I have a 1991 ford explorer and i ran into the same problem, i replaced the t stat 3 times flushed did a bunch of shit. So i decided to put a fan shoud back on the explorer and it never over heats now even when 4x4ing in heat, it does boil sometimes when im stuck in the mud and gunning it, lol i would recomend that you make sure the hole is at noon and go and get the truck up to operating temp and drive onto a steap hill and pop the raditor cap that way the rad it higher then the engine and it should burp the sysyem. Another thing to do it invest in a flex a lite and drop the clutch and get the flex instead and you will prob never run into over heating.
       
    7. dudefromflorida

      dudefromflorida Member

      Joined:
      March 27, 2009
      Messages:
      60
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Fuquay Varina, NC
      Year, Model & Trim Level:
      '94 Sport
      I have replaced the T-stat, temp sensor, the radiator cap is new (first thing that i replaced), and flushed the system then properly filled and burped it. It still overheats. The only things left are the fan and the radiator. My only thoughts about the rad is if it were that it would overheat all the time, (and thats not the case, also please correct me on that if I am wrong). So for lower rpm problems I can only think of the fan. I want to wear out all other possibilites before I tackle the fan, because if I tear off the fan cluth I am going to be too tempted to go with an E fan. I know that this is a very far guess but is there any way possible that my guage inside the truck is not reading right since the overheating is random? Also if that is the case what is a way to check to see if it is accurate?
       
    8. jd4242

      jd4242 Explorer Addict

      Joined:
      October 15, 2008
      Messages:
      10,821
      Likes Received:
      283
      Trophy Points:
      113
      City, State:
      va beach
      Year, Model & Trim Level:
      92explorer&94 ranger
      You buy a cheap mechanical gauge and put it in
       
    9. jd4242

      jd4242 Explorer Addict

      Joined:
      October 15, 2008
      Messages:
      10,821
      Likes Received:
      283
      Trophy Points:
      113
      City, State:
      va beach
      Year, Model & Trim Level:
      92explorer&94 ranger
      You can test the fans clutch just to give you an idea if its bad by letting it get up to temp or overheating point.shut the truckboff and see how hard it is to spin by hand,with the truck off!it should be tight or hard.no oil in the water or water in the out?
       
    10. dudefromflorida

      dudefromflorida Member

      Joined:
      March 27, 2009
      Messages:
      60
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Fuquay Varina, NC
      Year, Model & Trim Level:
      '94 Sport
      No mixture of fluids. Oil is fine, and water is fine. Also there is no loss of coolant. I will check the fan clutch out and see how hard it is to spin after driving to work this morning.
       
    11. s10 warrior

      s10 warrior New Member

      Joined:
      September 29, 2011
      Messages:
      20
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      hawaii
      Year, Model & Trim Level:
      1993 ford explorer
      sounds like a bad radiator. my old one did the same thing.. while driving it was fine, the air rushing on the radiator kept cool, sitting in traffic itd start to overheat, once moving again ,the temp would drop..
       
    12. mr cribb

      mr cribb US Army Retired Elite Explorer

      Joined:
      December 16, 2010
      Messages:
      2,305
      Likes Received:
      38
      Trophy Points:
      68
      City, State:
      Harviell, MO
      Year, Model & Trim Level:
      94 Chevy Z71, 93 X EB
      How well does the heater work? Possible heater core issue, that's what my issue was when I first got it. That was $23 and 20 min of work, no more overheating issues.

      I don't think it'd be the radiator if you're not losing coolant. Are the fins on the radiator straight and not all jacked up?
       
    13. toomanyfords

      toomanyfords Member

      Joined:
      October 2, 2011
      Messages:
      68
      Likes Received:
      2
      Trophy Points:
      0
      City, State:
      Rockville,MD
      Year, Model & Trim Level:
      98,93,and 91 explorers
      fan clutch

      If it were my truck I would put a fan clutch on it. Seems obvious, has to be either that or the radiator. try taking a garden hose when the truck is cool and spraying water through the radiator fins, watch the other side for a spot where water does not go through, will show if theres an obstruction in the radiator fins. other than that sounds like a fan clutch
       
    14. dudefromflorida

      dudefromflorida Member

      Joined:
      March 27, 2009
      Messages:
      60
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Fuquay Varina, NC
      Year, Model & Trim Level:
      '94 Sport
      I believe your right toomanyfords. Sorry it has taken a while to respond, I have been gathering information to post on here about the situation. I have recently put in an aftermarket thermostat to better comfort myself knowing the numerical temp insted of N-O-R-M-A-L, I have learned that when first started I can let it idle alllllllllll day long and it will never go above 195. When I start to drive let the engine really work then idle again there is no cooling it down unless I turn the heat on (yes my heat works fine mr cribb). I will try the water trick tomorrow to see what the rad looks like. But i am really thinking that it might be the fan clutch and if so I am going to do an E-fan swap. The reason for leaning towards a problem with the fan is how it can stay cool fine until it really has to work to bring the temp back down. I would think it would always have a problem if it were the rad. Also how much harder should the fan be to spin from the time I check it on a cold start to after I drive it and check it at an engine temp of 210ish? WHen i checked after driving it, I could not really tell a very big change if really there was one at all.

      Thank you again everyone for your input and hopefully afer the water check and whatever answer I get about the resistance difference this problem will be kicked to the curb.
       
    15. intelisevil

      intelisevil Elite Explorer

      Joined:
      May 11, 2006
      Messages:
      326
      Likes Received:
      2
      Trophy Points:
      28
      City, State:
      Sandy, OR
      Year, Model & Trim Level:
      '00XLT-SOHC,'99Mounty-5.0
      My bro-in-law's 91 had overheating problems similar to yours, he replaced everything except the radiator.

      One day he was looking at the front end and noticed the A/C condenser was plugged with dirt and bugs. After he cleaned that out he's back to normal cooling.
       
    16. s10 warrior

      s10 warrior New Member

      Joined:
      September 29, 2011
      Messages:
      20
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      hawaii
      Year, Model & Trim Level:
      1993 ford explorer
      just cuz it dont leak dont mean its good. my last explorer i had,when you touch the fins on the radiator, they would flake off. must have been the salt air?
       
    17. dudefromflorida

      dudefromflorida Member

      Joined:
      March 27, 2009
      Messages:
      60
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      Fuquay Varina, NC
      Year, Model & Trim Level:
      '94 Sport
      Wow. Completely forgot to give the final answer. It was the fan clutch. Thank you everyone for your input and help. Glad that it is finally running well and CONSTANT!!
       
    18. mordred612

      mordred612 New Member

      Joined:
      March 3, 2009
      Messages:
      16
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      tennessee
      Year, Model & Trim Level:
      2003 XLT
      Help!

      I did a job on my car last weekend and replaced the blend door actuator by following the steps in one the the posts here. It worked fine for a few hours then when I was turning it down to a little cooler temp I lost it all the way. I travel all the time and my car sits for a week or two at a time. This week when I came home I started it up and no heat as I left it. While I was driving home the check gauge light came on and and pulled over because the temp was high. What was strange was that it was hot then back to normal then hot again. I replaced the temp sensor and thermostat already. The upper hose is hot and feels like it has pressure in it. The hoses going to what I believe is the heater core on the firewall aren't hot. I'm at a loss and need to get it fixed.

      I do have a slow leak, but there is coolant in the overflow.
      The upper hose is hot and feels like it has pressure in it.
      The hoses going to and from the heater core are cold and I have no heat.


      I'm at a loss.
       
    19. Roadrunner777

      Roadrunner777 Well-Known Member

      Joined:
      February 5, 2011
      Messages:
      1,786
      Likes Received:
      98
      Trophy Points:
      68
      City, State:
      Bemidji, MN
      Year, Model & Trim Level:
      94 4x4 Sport 88k
      If this is on your 2003, you should repost in that section, this is for 1991 through 94. That said, if this were a '94, I would check the heater diverter valve. I don't know if a 2003 even has one.
       
    20. mordred612

      mordred612 New Member

      Joined:
      March 3, 2009
      Messages:
      16
      Likes Received:
      0
      Trophy Points:
      0
      City, State:
      tennessee
      Year, Model & Trim Level:
      2003 XLT
      Kind of chaps my butt that you can't just open the radiator cap and take a look at the fluid and see what level it is at or see if it is flowing through. I really miss my Jeeps.
       
    21. Currency

      Currency Active Member

      Joined:
      September 11, 2009
      Messages:
      616
      Likes Received:
      2
      Trophy Points:
      18
      City, State:
      Bedford Indiana
      Year, Model & Trim Level:
      94 XLT 4x4
      My radiator leaks at the very top, if I keep mine from getting completely full it will not leak. An old friend suggested a lower pressure radiator cap which reduced the leakage and this could help pressure in your system.

      Since you flushed it, replaced the cap (what pressure is the cap?), and replaced the T-stat, I would look for leakage around the heads or intake. If it is not leaking the problem is elsewhere. Like others stated, check the fan. Mine has cracks in it but works fine. The only time my explorer gets hot, half on temp gauge, is when I run it extremely hard.

      Not sure about the T-Stat in mine, but someone replaced the intake gasket at one time before I got it about two years ago. No over heating though.
       

    Share This Page







    We Support Our Troops!