Is anyone else having trouble with their truck getting hot when driving offroad in 1st or 2nd gear? There is a fan that kicks in and cools it off when it starts to overheat but I was wondering if there is a problem and or a solution just to keep this from happening. I have a freind that is having the same problem with his honda.
have you checked to see if the radiator is clean? i have loaded mine up with so much off road brush and foxtail weeds that it wouldn't get any air through it. also, what is "overheating"? is the gauge on the "H" or just above the center? you say your friend with a honda is having the same problem. that seems to be more environmental than a manufacturing defect to me. just a thought.
It gets almost to the H then the fan kicks in and cools it off and depending on what I'm doing it will go up and down. I have already flushed the radiator out and put in new antifreeze. It's 60 degrees here so I don't think that it is the temperature. Thanks for the response. Any help is welcome.
Hi Chris, not a zuki owner but when you did the flush did you use the air bleeds to get rid of the air pockets that happen? If you do have air trapped it can fool the sensor that turns on the fan if the air happens to be at that exact place. You could also have a faulty sensor or stuck thermostat, from previous reading I have read that it's very important to have a thermostat in these Kei trucks as they will overheat without one. Not sure why you would both be having problems besides being a coincidence.
I suggest that you take the truck to a proper radiator repair shop and have them test the rad for proper flow. They can also do a pressure test to see if there are any leaks. One test that you can do yourself is to check the radiator temp stating at the inlet and progressing to the outlet at the bottom with an infra red thermometer. The readings should progressively get less as you follow the coolant’s flow thru the rad.
I think what Mighty Milt was talking about is NOT the inside of your radiator but the outside. My Rhino gets mud and trail junk in it all the time and a quick shot with the hose will usually solve the problem. If there is too much crap in there, the air doesn't flow as well and will heat up.
that's exactly what i meant by environmental, not ambient air temperature, but the stuff you are driving through... just poke your head under there and take a look good luck
I've found this to be normal operation on some veihicles, not necessarily these trucks, as long as its not overheating. At low speeds if there's not air traveling across the radiator its going to get hot and depending on what the fan switch temp is it may show a higher than normal temp. You could also have a sticky thermostat. Thats where I would start, take it out and see if the problem goes away. -Greg
Check your lower radiator hose coming off the engine and see if it is spongy or soft, I have had no reason to check mine, but nearly all automotive lower radiator hoses have a spring inside of them to keep from collapsing when hot. Everything else mentioned to check is certainly spot on advice.
Dito on the lower hose. Ive had a couple of trucks that hoses lost integrity. I think thats spelled right. Got to remember some of these hoses are 15+ yrs old. www.traxandhorns
Hi, pls help me solve this problem. The temperature gauge reaches to H when running at more than 40kph and returns to normal temp when running below that or at idle speed. The reservoir is cool. Is there something wrong with the water pump? The backward movement of the gauge needle is fast once the accelerator pedal is released. It returns to normal temp before coming to full stop from fast driving.
try pulling the upper rad hose off the pump and fill it with water from a running water hose to fill the system you may have air it.this happened tome when I flushed my radiator.
There should be a bleeder screw beside the thermostat also. You can loosen that until it stops passing air and coolant comes thru. That should get rid of an air lock. On my Carry it's an 8mm hex head on the elbow fitting that covers the thermostat. My coolant system was pressuring up due to a blown head gasket.
Sounds to me like the lower hose is being sucked closed at higher rpm, at low rpm it will open and let coolant flow. My Carry runs the fan even when it's cold out if I am not moving vary fast. I also put a bug screen it front of my rad, I like to get off in the weed's LOL.
I flushed the radiator and drained the water jacket. I noticed a presence of sludge. Now my problem in overheating is solved..... in very simple way.
If you had sludge in the system you might want to clean out the coolant lines going to carb. as well if you didnt already do it. Those little coolant lines tend to have blockage about 75% of the time in the older trucks..
