Question about 1998 Isuzu Rodeo

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My 99 rodeo has been overheating after about 30 miles of driving, i took the thermostat out completely yesterday to see if that was the problem, and it overheated again today. Its blowing the lid off the overfill tank and then boiling out from it.. any suggestions? Yes the fans are working.

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Question:You mentioned that you took out the thermostat.Did you put it back in or replace it?If you are running without a thermostat,it will do that.Please at least let me know if you put it back in or replaced it at least.I would try replacing it as a first step if you didn't.Good luck!Greg

Posted on Aug 06, 2010

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  • super_girl_1 Aug 06, 2010

    yes i replaced it with a new one, and kept the a/c off. (seems to overheat faster with a/c on) hubby says one has nothing to do with the other, but i know what the gauges are reading!

  • super_girl_1 Aug 06, 2010

    also. idk if it has anything to do with it .. but i had a diagnostics ran on it yesterday and was told to replace the camshaft sensor.. are they connected in anyway?

  • Greg McCarthy Aug 06, 2010

    I just checked out 4 forums all about camshaft sensors and there was not 1 reference for overheating.It had more to do with misfiring.The a/c on does require more power so it is a good idea to turn it off and will overheat a little faster.The next best answer since we eliminated the thermostat I would say is a clog in the radiator.Seeing how it's a 1999,if you live up north where there are extreme seasonal changes,radiators seem to last a little less longer.I don't usually recommend a radiator flush(not on a regular basis anyhow) because it isn't as necessary as makers make it sound but I think that is your best option right now.A clogged radiator will cause low/no flow and will back up hot water coming out of everywhere though.Wherever the clog is,it cycles through from there then has very restricted flow so the return has nowhere else to go but the overflow tank.After you stop,it may be just open enough to allow fluid to seep back in enough because you said you can drive 30 miles.It is probably fairly close to the filler end.When you refill the radiator,does it back up quick?Also,please let me know what part of the country you are in.Super girl huh?I am impressed that a woman would want to get this involved with cars.Obviously not worried about breaking a nail.

  • super_girl_1 Aug 06, 2010

    when i refill the radiator, it seems like it takes awhile to back up, and usually i do it right away. someone told me to day to check the hoses after running it and to see if one is hotter than the other.. so i will do that when i drop my kids off for the weekend.. lol.. im in south carolina so our season changes arent dramatic, hot hotter and hottest, is flushing it something i can do myself?
    ps i have always loved cars, i was in the garage with my dad at an early age, but he would only let me hand him tools :( i recentley changed out my clutch and master cylinder on this same truck, i figure if i could do that i can fix the overheating.. :D

  • Greg McCarthy Aug 06, 2010

    I'm not so sure about feeling the hoses for a difference.The input will be cooler than the output hose for obvious reasons so I am not sure what they are trying to determine.For flushing the radiator,there are disposal concerns to consider.For one,it is not good to just drain it and let it run.Birds like the tast of radiator fluid and if they drink it they will die.Maybe call around some shops to find out about disposal recommendations.If noone has a good idea,maybe flush down the toilet?It would at least dilute.Once it is drained,letting it run shouldn't be a problem,but you should run water through the top at a fairly high pressure to try to unclog.It may back up,but not likely because of the clog.Just monitor the output flow.It should be fairly steady too.If at first you see intermittent flow then it goes constant,it may have unclogged.But still keep running water and watching.See how big the hole is where it comes from,and you should have a good sense of about how it should look since you've done alot of car work.I don't remember if there is a solution to add or not.I haven't done one in about 12 years.Also,sometimes if there is a problem with your radiator,it may get worse by flushing.That is why I would only try it as a last resort.The return line seems fine because it is trying to send fluid back but for some reason the radiator isn't accepting it as fast as it should be and sending it to the overflow so it is getting back to the radiator.Makes sense right?As far as driving 30 miles before overheating badly,there is something to that,I just can't pin it down.It seems pretty far,but I guess since it is a truck,everything is larger capacity.Something still seems strange about that 1 little piece though.I am in FL.I moved here 10 years ago from WAY upstate NY.People hear NY and automatically think NYC.It is a 6 hour drive to NYC from where I came from but a 1 hour drive to Canada.I could drive 15 minutes in any direction and be in corn fields and cows.Working side by side on a car with a southern belle?You're tugging at my heart. lol :()

  • Greg McCarthy Aug 06, 2010


    I just thought of something.The water pump.There seems to be water flowing,but if it is bad I do not know for sure if it will still send some water through or not.If it is not working fully,it may still send some water through,but it won't be able to keep up.Call a couple of local shops and ask about that,someone will always give free information because they want your business.Here is a link for how to diagnose it.

    This next site also suggests a loose serpentine belt could cause your pump not to be able to handle the load required which very much sounds like what I was talking about.It also somewhat explains why you are able to go 30 miles.The pump still works,but the loose belt does not let it run to full capacity.So you get coolant,although not quite enough,but gets enough to cool for a while but eventually overheats.Inspect your belt.I hope you read this before you flush your radiator.

  • Greg McCarthy Aug 06, 2010

    Also check the tensioner.If you tug or push on it away from the belt side,there should be pretty good resistance but should budge a little at least.If it moves somewhat easy,there is a problem with it.

  • Greg McCarthy Aug 06, 2010

    After I wrote the big long deal about flushing,I stepped away for a minute and it hit me,water pump.I started writing a few suggestions then I just googled water pump diagnose and the 2 links had great info.Sounds more like it! :)



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