Re: The car was running fine and suddenly made a loud...
Sorry, not the thermostat. Check the coolant level and refill and locate the leak. I suspect the waterpump, make sure the belt is turning the waterpump. Do not drive an overheating engine.
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No heat or low heat in a water cooled engine is worthy of an immediate check as major damage to engine could be the result of continuing to drive it. Things to check:
These two things may cause no heat and possible not ever show as a problem on the temp gauge or temp warning light until far to late:
Low coolant/antifreeze level
Frozen coolant/antifreeze
Stuck thermostat
Other possibilities that may/may not show other signs of trouble as well:
Failing water pump (this would also explain some noise, typically like a grinding, scraping or bad bearing noise)
Slipping belt (Typically associated with the famous belt squealing or chirping noise)
Clogged radiator and/or heater core
Non-operating temperature control valve
Stuck thermostat
Thermostat may be to low of a temp causing the over flow bottle to empty to soon. In other words sucking water out of bottle to soon. check water level off and on engine running
You may also want to check and see if the thermastat is working.If the thermastat is stuck open in cold weather car will take forever to warm up.This controlls the water flo from the engine to radiator.this will also make car run much colder(temp gauge will not register much change).
you ether have a coolant leak or one of these are the problem thermastat,fan clutch,water pump,radiator, try this start car when it reachs normal temp open hood and pinch the top radiator hose if it is hot water is flowing thermastat is good now open radiator with a towel slowly while it is runing see if the water is moving if it is you water pump and radiator are good, now at some point in this time you should have heard the fan get loud if not your fan clutch is not work it mounts to the front of your water pump and is normal to go out because they lose about 250rpm a year which does not give them much of a life, dont forget to check your heater hoses they could be leaking
when the engine is at normal running temp,feel the water hose on the bottom of the radiator.if it is hot then ur thermostat is fine,and its more likely to be a head gasket or airlock problem
Sounds like your water pump may be going out.If the fan is mounted on the water pump,grab the fan on each side and try to wiggle it.If it moves side to side any its bad.
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