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let the car cool down. feel radiator with coolant.start the car with a/c ON.the fan will tun ON if not the fan or power to the fan is a problem.
if the fan is good monitor the upper radiator hose for building high pressure before the hose is warm(cylinder head gasket is bad)
if the car don't overheat with a/c on(radiator fan switch is bad)
monitor the temperature to about 180*F-190*F and the lower hose will start to warm up. if not thermostat is bad.replace with fail safe one
good luck
You've already eliminated #3 and #6, so keep checking...
Priority Action Part Type Cause 1 Inspect Radiator Cooling System Clogged. 2 Inspect Radiator Radiator Fins Obstructed. 3 Inspect Radiator Cap Worn or Damaged Radiator Cap. 4 Inspect Radiator Fan Motor Faulty Fan Motor. 5 Inspect Belt Incorrectly Routed, Adjusted (Tensioned), Missing or Worn Drive Belt(s). 6 Inspect Thermostat Faulty Thermostat. 7 Inspect Water Pump Worn, Cracked or Leaking Water Pump. 8 Inspect Radiator Fan Relay Intermittent Failure
Hello,
Here's something that's a very common cause of overheating, and it's easy to check.
How to test the thermostat in most vehicles;
Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater temperature on high and turn the fan speed on high. 1. Listen very closely for a click sound from the engine, ( most thermostats make a click when they open ) 2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate. 3. Usually within a few minutes the radiator fan will kick.
What the thermostat does;
It seperates your coolant into two parts. The first part is in your engine, the second part is in your radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows from the engine into the radiator and reservior to be air cooled by the radiator fan.
see the radiator fan does it work when the engine is hot
there are two things
if the fan is not working check it by attaching it direct current from the battery
if it works late see the thermostat
check the radiator for any blockage
Hello,
Most often that is caused by a bad thermostat.
How to test the thermostat in most vehicles;
Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater temperature on high and turn the fan speed on high. 1. Listen very closely for a click sound from the engine, ( most thermostats make a click when they open ) 2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate. 3. Usually within a few minutes the radiator fan will kick.
What the thermostat does;
It seperates your coolant into two parts. The first part is in your engine, the second part is in your radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows from the engine into the radiator and reservior to be air cooled by the radiator fan.
Sounds like you have a stuck thermostat. Trace the upper radiator hose back to the engine. It should go to a housing that usually has two bolts. While the engine is cool, remove those bolts and take off the housing. That will expose the thermostat. Replace it with a new one, recommend the lifetime replacement, and a new gasket. Leave the radiator cap off, top off the radiator with antifreeze and crank engine. Let it warm up and cycle through to top off the radiator and get the air out of the system.
What makes you think its the relays ? How about THE FANS themselves, or the coolant switch that tells the electric fans when they should turn on. Test his procedure. Place the climate control on AUTO at 65. A/C compressor turn on ? Did the COOLING FANS tun on ? If they did , at least you know they work. Hope this helps.
yeah try to change the sensor.maybe it is busted. normally, most of the late-model cars comes with a fan feature that turns of after 5 or 10 mins even after switching off the engine. this helps to cool down first the engine to reach its desirable temperature before it is totally shut down. its good that your radiator fan has a feature like that. aftermarket perfomance fans do come with that feature because it takes care of the engine state.just try to change the sensor for engine temp
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