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Rover 25 1.4 2004 hot engine and radiator fan problem

Hello, i have a rover 25 1.4 2004 had some problems. 1.engine temperature is going high, head gasket done, coolant water pump & thermostat done temperature switch is done but still it is hot. i think thermostat valve is not opening when engine hot and coolant water is not circulating properly. 2.also radiator fan is not working automatically when engine is hot, otherwise it's fine it works alone when remove the temperature switch connector. can any one help me to find the problem and fix my car. Thanks

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  • Tanweer Ahmad Apr 21, 2013

    i am sorry i forgot to mention the radiator is also been checked and coolant is bleded properly no air or leaking in system and no low level of coolant, yes one thing i will check tomorrow that thermostat is not inserted backwards is this possible ?.

  • Tanweer Ahmad Apr 21, 2013

    i am sorry i forgot to mention the radiator is also been checked and coolant is bleded properly no air or leaking in system and no low level of coolant, yes one thing i will check tomorrow that thermostat is not inserted backwards is this possible ?.

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  • 149 Answers

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

Posted on Apr 21, 2013

  • Tanweer Ahmad Apr 22, 2013

    Yes i checked the thermostat it's in right direction, also radiator fan is working when takeout the connector from sensor. Radiator is not blocked. Is there any other switch and the temperature meter is stuck in the middle does not go further. Thanks

  •  Mike McDonald
    Mike McDonald Apr 23, 2013

    Possible inaccurate temp gauge, temp sending unit. Have the cooling system inspected by a block test. It's a chemical test to determine if exhaust gasses are present in the cooling system. I know the head gaskets were already replaced, but a warped or cracked cylinder head can duplicate the symptoms you describe. d

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Posted on Jan 02, 2017

localwonder
  • 6784 Answers

SOURCE: 2000 Sunfire coolant problem. Engine overheating,

ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostat inserted backwards.

Posted on Mar 13, 2009

Wolfman304
  • 720 Answers

SOURCE: 1995 Toyota Camry 4 cylinder runs hot

Hi,

Firstly, ensure you have the required 'mixture' of coolant/water (must have required coolant).

Second, I would recommend you re-test all the cooling system sensors again (make sure they're within specifications), in case a new one is faulty.

Third, ensure the new thermostat was of the correct temp setting (they all differ), so that it opens at the required time. Most cooling systems operate within 90 - 100degC.

Fourth, make sure the radiator (and associated hoses) aren't blocked.

If your temp gauge is reading higher than normal, but NOT in the danger zone...then this can be considered normal (especially if you've replaced with new components) and nothing to be concerned about.

However, if the temp gauge IS in the danger zone....then this suggests the coolant is not flowing through the cooling system properly.

If all above components test ok, then it's possible your water pump may not be pumping enough volume.

Cheers,

Posted on Aug 16, 2009

Testimonial: "I appreciate your help...Maybe I should just relace the water pump, that would be the last thing that I would need to replace."

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