Honda Luxline 1500 16v getting hot.

Warped head or a blown head gasket. Look in the radiator with the cap off and the engine running. If you see bubbles, then compression gases are getting by the head gasket. Worst case would be a crack in a cylinder head.

Looks like you have a leaking head gasket or cracked head. You can buy a head gasket leak detector kit that will let you know if there is CO2 gas escaping through the radiator. I think that it is this gas leak that makes it look like your radiator is boiling.

You would probably be better off replacing the belt and pump again since the labor would be next to nothing.
I would want to test the cooling system for exhaust gas and try to verify the head gasket is actually leaking next.
Are you loosing coolant into the cylinders ? There may be something else causing the engine to run hot such as exhaust problems.

A cracked cylinder head?? Head gasket not sealing due to a warped cylinder head?

check radiator is not blocked, check air can pass through radiator (fins not blocked with debris) check that there is no airlock in system. is header tank being pressurised when engine running ( remove cap and start engine, look for bubbles in header tank). If bubbles then you need to check head gasket or even crack in head or cylinder walls. Presume you fitted the thermostat in the right way round. if you have boiled the engine since fitting the thermostat you will probably need to remove it (maybe see if it boils without it fitted) and possibly replace it again. (drop in hot water and see if it opens, if it doesn't then replace it)

Cracked Cylinder head or cylinder head gasket blown. Bet you filled it up with cold water when it was hot! Check your oil level, see if it is going up (water getting in) Remove the rad cap start your engine and if it blows the water out then i'm probably right.

Heater hose, lower or upper radiator hose, head gasket,heater core,thermostat housing gasket,engine block,cylinder head (Internally),
water pump.These are few key areas. A coolant pressure test will rule out many of these areas.

Your positive that the radiator temp sensor is accurate? And what do you mean by hot? Range preferred, and also what it usually goes up to after driving 5km Also did you check the fan motor and the Temp switch? to turn on the fan?

Ford 2000 Taurus

To solve the problem you have the things to do in this order;

) When the engine is cold top off the radiator with fluid. (When the pump was replaced the fluid should have been also)
) Make sure the radiator fluid has anti-freeze in it. This is also anti boil also !
) Add fluid to the overflow reservoir.
) Make sure the drive belt was replaced on the water pump.
) With the engine running, you can add fluid to the radiator for the first minute or so. You want to get air pockets out.
) Replace radiator cap.
) Let car warm up. When it's hot you should get the radiator fan coming on.
) When it get hotter the air-conditioning fan may come on.
) If the fan does not come on, the heat sensor is probably bad.
) If all fans come on, and it overheats, you may have a bad thermostat. Trace the upper radiator hose to where it connects to the engine. That's where it located.

Do not operate the engine when it overheats, You will damage the head gaskets and cause radiator fluid to leak into the cylinders.
If you smell radiator fluid in the exhaust fumes, it may already be leaking.

it is most likely your heater core