Hyundai h100 2.5 turbo diesel the radiator water bottle keeps on over flowing and the radiator water is low have to top up every other day please note the h100 is not a accent had to click that as there was no h100 van on the select car list

Go to the radiator and look for a hose either on top going to the overflow to the bottle or at the bottom hose look for a tee fitting with the hose going to the bottle it's a white plastic bottle search your van for 2002 ford transit overflow tank and you'll see it ok

that normaly only happens if the radiator fan is not working or the water pump has given up

1) Drain radiator by removing cap, and bottom radiator drain bung or bottom hose.
2) Remove top hose.
3) Disconnect the radiator fan's wiring and any temperature sensor wiring if fitted.
4) Remove radiator retaining clasps
5) Disconnect radiator bottom hose.
6) If fitted with an auto box, then remove automatic gearbox oil pipes (Underside)(you might wat to clasp these so they don't leak oil everywhere)
7) Remove radiator expansion bottle feed pipe from top of radiator.
8) Ease out the radiator. If the radiator fan is getting stuck or caught up, then drop the radiator back down and remove the fan first after disconnecting from the radiator body.
9) With new and old radiator placed side by side on a soft surface, change across any components from the old radiator, which didn't come with the new one. These may or may not include such things as: cap, fan retaining screws or clips, bottom radiator seating rubbers, rubber fan shrouding, temperature sensor, top and bottom rubber hoses.
10) Rebuild by reversing the above instructions. Apply silicone pipe sealant to top and bottom hose locations. Make sure you clean and/or replace any heavily corroded metal pipes which connect to the radiator. (Now is also a good opportunity to replace the thermostat to be on the safe side)

11) Fill system with a fresh 50/50 water/antifreeze mix, flush out and refill expansion bottle. Just before you refill the system, turn the interior heater setting up to maximum heat, but do not start the vehicle.
12) Top radiator up to max. Gently massage the top radiator hose to help eliminate air from the system.
13) Once filled, start the car. Pay attention to the temperature. Keep topping up the radiator as bubbles come around the system and the coolant level drops. At the point no more bubbles appear, close off the radiator with the cap. Allow the engine to reach normal operating temperature. If the weather is cold you may want to hold the engine at around 2,500 revolutions to help build heat faster. Keep it running until the radiator fan kicks in, then let it idle for a couple of minutes.
14) Stop the engine and let it cool.
15) Once cool, open the radiator cap and top up again if level is low.

16) Road-test the vehicle. After returning check again for any leaks.


Running the car for the first few days after radiator replacement, check the radiator level and expansion bottle level every day for the first two or three days. This level may drop slightly as any trapped air pockets are pushed out while running. Also, it is possible that any small leaks may begin after adding fresh anti-freeze to the system. If you begin loosing fluid over these first few days, then re-inspect your work and run a cooling system pressure test.

1. When setting the temperature to MAX, blower level to FULL and outside air Vent CLOSED, no hot air comes out after 2-5 minutes?
If YES, when did you last flushed your radiator and is it full?
2. if more than 5 years ago, flush radiator system, instructions are usually in Owners manual. Use a bottle of Radiator cleaner, run egine hot for about 10-15 minutes, carefully open petcock in bottom of radiator to flush out radiator, WARNING, careful as flushed coolant would be boiling hot. As sson petcock is open and water start to flow out, carefully open radiator cap to enhance flushing flow. Use garden hose to fill radiator while flushing until water coming out from petcock is cold and clear.
Once clear, start engine, turn heter full and blower full blast and keep hose in radiator flowing full, leave petcock open until clear water flows out again. Once clear waters comes out, turn off engine,turn off garden hose and let water drain empty radiator. Once it stops flowing out, close petcock snug and put radiator cap on, pull off radiator coolant catch bottle, clean bottle for any debris and dirt. Drain any water, leave bottle empty and put it back onto its place.
3. Fill radiator with 1 gallon (4L) of concentrated coolant, top up radiator until full, fill catch bottle with concentrated coolant, start engine and keep it overflowing until no bubbles comes out and the radiator is fully hot. Once it is flowing good, close and connect everything. Drive with it and keep catch bottle filled as necessarry.
Good luck. Give as vote and good comment if this advise solve youor problem. Thank you.

IS THE RADIATOR COVER SUPPOSED TO BE PRESSURIZED???
IF SO THEN YOU DON'T HAVE THE RIGHT TYPE, TRY THAT FIRST
IF IT IS SUPPOSED TO HAVE PRESSURE THEN YOU NEED TO LEAVE SOME BREATHING AIR IN THE OVER FLOW BOTTLE, REMEMBER TO NEVER FILL TO THE TOP.

Hello there:
This problem normally is caused by a couple of things that you can check
First start the vehical and open the radiator cap and look to see if you can see the water inside the radiator moving around if not you might have a clogged radiator or the water pump is bad
now when the car is getting hot try to hold and squeese the top radiator hose to see if it is hard and you cant squeeze it than this will tell you that the thermostat is not opening up and letting the water thru to cool the engine or that it is only letting some of the water thru in any case i would replace the thermostat first and then follow the other troubleshooting steps that i have provided ok and you should be ok after making the needed repairs.
Hope this has been very helpful for you
Best regards Michael

It is not likely the thermostat, because the thermostat is showing that it is overheating,so it is working, you must have a coolant leak somewhere. You will have to find coolant leak. Car is overheating because it is low on coolant

Usually it is close to the water pump.Two smaller size hose should come out from under the cover of the thermostate .You probably need to remove the top cover to see the thermo valve itself.If the thermostate not working(or not working temporary)then main radiator in the front of the wehicle stays cold.Thermostate can get stuck,it means that it is working sometimes,sometimes not so the hot water cant get to the radiator to cool down .Pressure goes high up ,water runs everywhere.There is one more thing can cause such problem on your car.If the water reaches a certain temp then a ventilator should turn on on the radiator which suppose to cool down the water.If you drive fast enogh then the travel wind can do the same thing .So probably your ventillator stoped working.

First, Is there actually coolant in the over flow tank?

If the bottle is full the coolant level sensor may be bad. The sensor pulls out the bottom of the overflow reservior.

If the bottle gets low overnight there is a leak. Check the radiator side tanks for leaks. You need to look from underneath the car at the joint where the radiator meets the black tanks on the left and right sides.

You also need to look from underneath for most of the other hoses on the car, the car is turbo most likely and there are hoses that go to and from the turbos, into the cabin, and to and from the engine.
Leaks are hard to find from just looking from the top of the engine.

Hope this helps.

have you flushed out the radiator ? get some radiator flush and flush it out. There could be a blockage in the radiator.