What are the first signs of the head gasket going
Check compression
When the engine is "over heating" are the radiator cooling fans running on high speed?
Has there been any engine work performed on the vehicle lately?
Let me know.
Regards,
SOURCE: How do i solve rim leak on a rover 25
If the problem is sealing around the bead, the tire needs dismounted and the corrosion cleaned off of the wheel. In extreme cases I've had to use a thin layer of spray gasket maker to fill in some rough areas. If the problem lays in the wheel where the tire does not contact, some grinding and RTV can fix it, also with the tire dismounted.
SOURCE: range rover 2002 model 4.4i petrol engine, every
It appears that you have a minor leak at where a hose attaches to an engine or radiator pipe. When the engine is hot, any small leak will evaporate quickly and therefore not be seen. As the coolant heats up it will expand into the overflow tank but once the engine is stopped the extra heat build up will force the coolant out the leaking joint. As the engine cools, the leak prevents the coolant from being sucked back from the overflow tank. Check all hoses and clamps including heater hoses and those pesky little bypass hoses in the cooling system for a good tight fit and replace any hoses that have gone hard or have become soft and stretched. Those spring type hose clamps tend to be less effective in clamping as the hoses age. Worm drive ones are the best to use. If unsure take vehicle to a cooling system specialist and have them do a pressure test and more thorough diagnosis. If problem persists, then it could indicate a problem with the head gasket (Usually caused by allowing engine to become excessively overheated when cooling system has run dry) allowing very hot high pressure combustion gases into the engine water jacket, which super heats the coolant in the engine block, which then boils off, and is released via the cap or any leaks. If the head gasket is really bad it will leak water into the cylinders and into the oil in the sump. This is indicated by an emulsion of water and oil mix on the dipstick. You will also see white smoke (water vapour) from the exhaust.
SOURCE: rover 25 1.4 2004 hot engine and radiator fan problem
Yes, it is possible to install a thermostat backwards, though unlikely. If the thermostat isn't opening properly, the hot engine coolant won't be flowing over the cooling fan switch and give you high temps. I would first determine if the thermostat was opening at all, and if it is, is it opening at the proper temp. I have had many new thermostats that, while new, didn't work correctly. To check the cooling fan motor, turn on the AC(if equipped) and the fan should engage. If no AC, disconnect the cooling fan switch, and the fan should engage. Check for power and ground at the fan motor. If you have both power and ground, the fan motor is faulty
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