Honda Car Forum

i replaced the thermostat and radiator and it still overheats, for a while i took the thermostat out and just drove like that and it kept it from overheating, but since i replaced the radiator i put the thermostat back in thinking it would be ok, but it still overheats, why is that??? what should i do my hoses are hot which is an indicator that the water pump is ok. what should i do...????ok today the 10th of january the day after i replaced the radiator, and i checked to see if the hoses were hot, because if so, that would indicate the the water pump is working, and so i checked, and the lower radaitor hose was cold while all the others were hot, which tells me that there is a thermostat problem becuaxe my lover radiator hose runs to my thermostat housing. yes the thermostat is in correctly, when the motor get hot steam has come from it before...??the coolant does not need flushed cuz i already did it and when i replaced the radiaor i put new coolant in, i am thinking of just taking out the thermostat and see what happens...Any ideas????the head is not cracked and i did not blow a head gasket becuase i donot have milky substances in my oil and i do not have white smoke coming from my exhaust, my engine was rebuilt a few thouasd miles ago if that helps at all...any ideas????yes the thermostat is good and what about this bleed tube someone mentioned???

is just your cluster temp gauge is telling you its over heating, or do you have steam coming from under the hood?Have you tried flushing the coolant?Did you pressurize the fluid once you replaced the radiator?What psi is the cap on the radiator? I accidently lost my cap one day, and went and picked one up at a junkyard. Unfortunatly, the orignial cap was designed for 9 psi, while the cap i swapped was 7.1 psi, and this caused over heating and a boiling of the coolant. (Maybe boiling is a bit over-exagerated)

Check and see if the hoses are collapsing when the engine gets hot. Remove the hose and look into it, you may find that the inner rubber ply is loose and causing a restriction. This restriction plus the thermostat restriction may be causing the problem.

ok.... you need to get a compression test done..... when a car over heats after what you have done, it sounds like a cracked cylinder head or blown gasket..... if it bubbles when you turn it off (gurgles in your over flow) you have heat seeping into you coolant system,,,,,, alum. heads are known for warping.....

did you check the cooling fans

1. check the cooling fan, connect to the battery to see if it works.2. check the thermostat switch to see if it turns on and send signal to the cooling fan while the car is heat.3. check water pumphope it helps

this might sound really dumb but make sure your thermostat is going in the right direction, they usualy will go in both ways, and if its backwards it wont open

Sounds to me like there is a block in the cooling system, your water pump would be leaking through its weep holes if that was the problem. Also you need to flush the system and make sure that you open the bleed screw to allow the air out, air in the system will cause this. Also are you sure that the thermostat isn't in backwards and it is any good? If it was a headgasket problem then it would be using coolant and you would most likely see some visible smoke, i doubt that is the problem. However if you run it hot it can lead to that problem because the head can actually warp.

Did you install the correct theromstat for the car? Did you check to see if the fans are working?

Ok there are alot of good responses. I would check the following once more. Correct radiator cap, functioning cooling fans, blockage within engine block or hose, proper filling of the radiator, plugged radiator, cracked head, cracked cylinder wall or blown headgasket, etc. If all of that has been done and is fine then, according to your post you stated that someone rebuilt the motor, your cylinder walls might be too thin. Sometimes when people rebuild motors they use oversized pistons. If they bore the cylinders too much it can overheat the motor quite frequently. A measurement of 0.40mm is the maximum I would allow. Many people take it to 0.50mm but that can cause heating problems in some motors.The reason is because the water is positioned too close to the combustion chamber and the heat that is created within that chamber heats the water too quickly and to a very high temprature that exceds the normall operating temp.If this is the case then I would most definately return to the people that rebuilt your motor and demand another engine. Otherwise take them to small claims court.