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Re: thermostat will not open
If the top radiator hose is not getting hot you know the coolant is not passing the thermostat. The last gentleman to answer you is probably correct. The thermostat must face the correct direction for the hot water to open the thermostat.
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I would say more than likely it the radiator cooling fan. For some reason some vehicles, no matter what temperature, the cooling fan clutch engages which makes the cooling fan run at full speed like there's no fan clutch.
It sort of makes it sound like the engine is revving up but it's simply the sound of the rushing air from the fan clutch making the cooling fan spin at full speed.
thermostat is on the waterpump. Follow the lower radiator hose to the housing. there should be three 10mm bolts should be holding the housing to the waterpump with the thermostat in between. If you are going to change it, then drain your cooling system first.
1 disconect neg.battery cable 2 drain the cooling system 3 remove air intake tube from filter housing to throttle body 4 remove top half of fan shroud 5 remove the serpentine belt 6 use a strap wrench to prevent the waterpump pulley from turning while turning the fan clutch in the counterclockwise direction. 7 remove fan and set aside 8 remove belt tensioner 9 remove hoses from water pump 10 remove 6 bolts, 3 on either side and remove the water pump. 11 remove the thermostat housing from the old pump and install on the new one. 12 re assemble in reverse order. make sure the mating surface of the engine block where the pump bolts on is clean and free of old gasket material before installing new pump and gaskets. When assembled fill cooling system, start engine and let idle untill thermostat opens and engine reaches operating temp.KEEP WATER LEVEL FULL. After a test drive recheck the coolant level, and you are done.
1 disconnect battery ground cable
2 drain cooling system
3 on models with a/c, proceed as follows:
a discharge a/c system
b loosen upper and lower compressor bolts and remove compressor drive belt
c remove a/c line from top of radiator shroud
4 remove water pump drive belt
5 remove reservoir tank from radiator bracket
6 remove radiator shroud and fan/clutch from vehicle
7 remove waterpump pulley from waterpump
8 remove timing tensioner and timing belt
9 remove dipstick tube
10 remove alternator mounting bracket at water pump
11 remove water pump mounting bolts and water pump
12 reverse procedure to install, using new gasket and rubber seal
The shroud around the radiator fan mainly assists cooling at lower road speeds - it increases the efficiency of the cooling fan/s.
At higher road speeds the increased airflow due to vehicle speed makes the fan and shroud less important in that circumstance.
Running hot at higher roadspeeds can be caused by either engine mechanical fault (blown headgasket etc) or defective cooling system:-
Check for combustion gas bubbles in coolant reservoir - and ensure engine has no other mechanical running problems.
Check cooling system as follows:-
1) Faulty thermostat,
2) Blocked radiator air flow due obstruction such as grasshoppers or other insects,
3) Blocked radiator core (internal) by sludge/scale etc.
4) Collapsing radiator hose on intake side of waterpump (due to softened hose),
5) Cooling system not properly filled with coolant due air locks in the system - bleed off any air (as manufacturer specifies) during re-fill with coolant and ensure flow to heater core is enabled.
Your overheating problems can have several possible causes.
1) Airlock in heating system - solution - bleed air from cooling system. Method is dependent on make/model of vehicle
2) Radiator blocked - solution - drain and flush radiator
3) Failed waterpump - solution - fit new waterpump
4) Engine thermostat stuck in closed position - solution - fit new thermostat
5) Electric cooling fan (if fitted) failing to operate - solution - check fan, fan operating switch, all wiring and connectors
6) Not enough coolant in system - solution - check and top up to required level. Also check all hoses for sign of leakage.
7) Faulty temperature gauge giving incorrect reading
Your overheating problems can have several possible causes. 1) Airlock in heating system - solution - bleed air from cooling system.
2) Radiator blocked - solution - drain and flush radiator 3) Failed waterpump - solution - fit new waterpump 4) Engine thermostat stuck in closed position - solution - fit new thermostat 5) Electric cooling fan (if fitted) failing to operate - solution - check fan, fan operating switch, all wiring and connectors 6) Not enough coolant in system - solution - check and top up to required level. Also check all hoses for sign of leakage. 7) Faulty temperature gauge giving incorrect reading.
This is called your waterpump, you need to have the vehicle towed to a repair shop and have it replaced. If you want phone around to get quotes on the job, just ask them how much it would be to replace the "waterpump".