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1. Make sure you do not have an air bubble in your cooling system. Easiest way is to park facing uphill and let the car cool off. Remove the radiator cap, start the car and let run until the thermostat opens. If there are air bubbles in the cooling system the should be forced out. Top off fluid.
2. Are you sure that the cooling fan is running? When the car is getting hot, open the hood and make sure the radiator fan is actually turning.
The coolant sensor is in the front the thermostat housing that the top radiator hose goes to has the sensor in it, but if your wandering cause your cooling fans do not work it's most likely not the sensor. The largest proble I have seen with them is the cooling fan relay, the part is roughly $60-80.00, but that's the easy part, a shop will charge you out your rear to do it cause technically you should remove the complete whole front facia and bumper assy to do it, but there is a trick, if you plan on fixing this yourself let me know I'll clue u in on a little bit easier way.. Oh generally when the relay goes bad you will also have a check engine light on as well!! Usually cooling fan relay control circuit!
Before you start remove the ground cable from your battery. Remove the radiator shroud that covers the top of the radiator.Then there should be a connector that plugs into the cooling fans disconnect this plug.There are 2 or 4 bolts that hold the cooling fans in place.Remove the bolts and the cooling fans.Then you want to drain your cooling system.Once its drained remove the upper and lower radiator hoses and the overflow tube.Then you want to remove the transmission cooling lines on the left side of the radiator.Be sure to put a pan under it because it might leak a little fluid out of them.Now on the top of the radiator there are two brackets that hold the radiator in place.Remove these brackets and carefully remove the radiator.Alittle tip for you when you put the new radiator take the box it came in and cut pieces of cardboard to cover the fin area so that when you put the cooling fans in you don't damage the new radiator.Once there in then you can pull the cardboard out.Once you have it installed and everything is hooked back up fill it with anti freeze and check for leaks.
You evidently have a problemwith your engine cooling system. Check to make sure that the cooling fins on your A/C Condensor and Radiator are not clogged up with dirt and debris. Check that your mechanical fan clutch has some resistance to pushing it by hand. If it spins too freely. the fan clutch could be worn out. Check to see how much air it is actually moving through the radiator. When the engine is at operating temperature and the A/C is on, This fan should be turning at a very high speed and blowing HOT wind in your engine compartment. I believe that your vehicle is also equipped with an electric cooling fan. The electric cooling fan should be running any time the A/C compressor is engaged. If not, then you must diagnose this failure.
On some models, it may be necessary to disconnect the coolant hoses from the radiator to allow clearance for removing the fans. If so, drain the cooling system, then disconnect the hoses.
Unplug the fan electrical connections.
Remove the mounting bolts holding the fan shroud and remove the shroud with the fan. Once removed, the fan blade may be unbolted from the shaft and the fan motor removed from the shroud.
Fig. 1: The fan shrouds are secured to the radiator with a series of small bolts
Fig. 2: When removing the fan shroud, be careful not to damage the radiator cooling fins
Position the fan on the radiator and install the mounting bolts. Tighten them to 5 ft. lbs. (7 Nm).
Engage the electrical connections.
If applicable, refill the cooling system.
Start the engine and allow it run until it reaches normal operating temperature. Check that the fan(s) turn on. Check for leaks.
Drain engine cooling system as described. Disconnect upper radiator hose (8260) and lower radiator hose (8286) and radiator overflow hose (8075) from the radiator (8005). Disconnect the transmission oil cooler inlet and outlet lines from the radiator.
Remove cooling fan motor,fan blade (8600) and fan shroud (8146) assembly as described.
Remove radiator upper bracket retaining bolts and remove bracket. Lift radiator from vehicle.
Position the radiator into the vehicle. Install upper brackets and tighten bolts securely.
Connect the transmission oil cooler lines to the transmission oil cooler fittings.
Install cooling fan motor, fan blade and fan shroud assembly as described.
Engine Cooling Fan Motor, Fan Blade and Fan Shroud Assembly, Electrical
Disconnect (pull apart) the male-female cooling fan motor wiring connector at the side of the fan shroud (8146). Remove the male terminal connector retaining clip from the fan shroud mounting tab.
Remove two fan shroud upper retaining bolts at the radiator tanks.
Lift cooling fan motor/fan blade (8600)/fan shroud assembly past radiator (8005), disengaging fan shroud from two lower retaining clips.
Follow removal procedure in reverse order.
Tighten fan shroud retaining bolts to 5.2-7.2 Nm (46-63 lb-in).
Below are instructions and a diagram for removing the radiator from your Santa Fe. There's nothing involving the motor mounts. Best of luck and please post back with any questions or just to rate the solution. Greg
Drain the cooling system. Remove the radiator cap to speed draining.
Remove the inlet hose from the radiator.
Remove the transmission oil cooler lines from the retainer clip at the bottom of the cooling fan shroud.
Remove the fan shroud clip from the condenser tubes.
Remove the bolt that connects the fan shroud to the condenser hold down bracket.
Remove the air deflectors from the top of the radiator.
Remove the cooling fan shroud bolts.
Remove the coolant reservoir hose from the radiator overflow neck.
Remove the radiator upper support brackets and bolts that connect to the fan shroud.
Disconnect the engine cooling fan motors electrical connectors.
Remove the cooling fan motors electrical harness from the fan shroud clips.
Remove the cooling fan shroud.
Remove the outlet hose from the radiator.
Disconnect the transaxle oil cooler pipes from the radiator.
Tilt the top of the radiator rearward.
Remove the condenser hold down bracket from the radiator.
Lift the condenser from the mounting tabs on the radiator and position the condenser aside.
Install the engine mount struts. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) coolant. If Coolant other than DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) is added to the system the engine coolant will require change sooner; at 50,000 km (30,000 mi) or 24 months.