Top hose hot and bottom hose cool...replaced radiator,condenser auxillary fan unit/resistor, replaced harness (spliced) from aux fan unit to temp sensor in the radiator...fan wont work and I dont think water circulates...any idea?

Not normally. If the heat temp GAUGE shows hot and the A/C blows warm you could actually be having a hot engine.situation. The heat GAUGE is controlled by the TEMP SENDER UNIT and has no connection with the A/C other than the A/C condenser rides in front of the radiator and catches all the debris first which can plug up the air flow to the radiator and cause the temp gauge to climb. If the A/C condenser is plugged by dirt and debris the Freon can't get cooled down enough to cool the cabin temp very well.
My suggestion would be to back wash the radiator and condenser. Use a high pressured garden hose and from the engine bay squirt the hose through the radiator and the condenser both to remove what you can't see. Be very careful not to bend the cooling fins of either the radiator or the condenser.

sounds like the thermostat may not be opening.

your auxillary fan is not working. this fan is responsible for cooling the freon that is being circulated in your cooling system... check if there are any loose wires in front of the engine bay.

the auxillary fan is located right beside your radiator fan.

a great AUX water pump can be added on most vehicles by adding a TEE to the heater hose that feeds your heater core. Although your heater will not be as hot. Assuming that is not an issue.

From the TEE, add a hose to an electric water pump from a HVAC company. There are many and they are designed for hot water and pressure. if it is just pumping you want, then run the output right back to the radiator ( top hose - typically ) and it will be cooled by the radiator.

If you are looking for MORE cooling capacity, then run your AUX water through another radiator or coil of copper someplace convenient, and then back to the radiator. Depending on your needs, make the pump as large as your heat problem demands. remember - if your engine is not running and feeding this type of system, you may starve the AUX pump for water. the engine water pump is priming the AUX pump in this configuration. Good luck , Be cool :)

Welcome to Fixya

Sounds like you have a problem with the cooling system. First thing you need to check first if the auxillary fans are working from the time you are the engine is overheating. If the auxillary fans is not working then the problem would be the aux fan itself or relays. if Fan is working then you might have a poblem with the water pump.

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About 2.5 hours

Hope this helps, it it does please leave feedback and vote Thank You and Good Luck

• Tools Required
• J 38185 Hose Clamp Pliers

Removal Procedure



Caution: Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

1. Remove the battery.
2. Remove the air cleaner assembly.
3. Drain the cooling system.
4. Remove the right and the left engine mount struts. Refer to the following procedures:

• Engine Mount Strut Replacement - Right
• Engine Mount Strut Replacement - Left
• Engine Mount Strut Replacement - Right
• Engine Mount Strut Replacement - Left

1. Use J 38185 to remove the inlet hose clamp from the radiator.
2. Remove the inlet hose from the radiator.
3. Remove the transmission oil cooler lines from the retainer clip at the bottom of the cooling fan shroud.

1. Remove the bolt that connects the fan shroud to the condenser hold down bracket.

1. Remove the cooling fan shroud bolts.
2. Remove the coolant reservoir hose from the radiator overflow neck.

1. Remove the radiator upper support brackets and bolts that connect to the fan shroud.
2. Disconnect the engine cooling fan motors electrical connector.
3. Remove the cooling fan motors electrical harness from the fan shroud clips.
4. Remove the cooling fan shroud.
5. Remove the bolt from the condenser tube support bracket to the radiator.
6. Use J 38185to remove the outlet hose clamp from the radiator.
7. Remove the outlet hose from the radiator.
8. Disconnect the transaxle oil cooler pipes from the radiator.
9. Tilt the top of the radiator rearward.

1. Remove the condenser hold down bracket (1) from the radiator.
2. Remove the air deflectors from the top of the radiator.
3. Lift the condenser from the mounting tabs on the radiator (2). Position the condenser aside.
4. Remove the radiator.

What are you going by to say it's overheating , temp gauge ? Have you test to see what the actual temp. is > Hook - up a scan tool ,what's the PCM - engine computer seeing for engine temp. ? 223 degress the PCM should turn on the cooling fan . You could buy a Non-Contact Infrared Thermometer With Laser Targeting at harbor freight ! Radiator very hot ????? What is the right temp .
Non Contact Infrared Thermometer With Laser Targeting

Could be a bad temp gauge . Is the coolant surging inside the cooling system ? Does it have a radiator cap ? Have you replaced it ?

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

1. Drain the cooling system. Remove the radiator cap to speed draining.
2. Remove the inlet hose from the radiator.
3. Remove the transmission oil cooler lines from the retainer clip at the bottom of the cooling fan shroud.
4. Remove the fan shroud clip from the condenser tubes.
5. Remove the bolt that connects the fan shroud to the condenser hold down bracket.
6. Remove the air deflectors from the top of the radiator.
7. Remove the cooling fan shroud bolts.
8. Remove the coolant reservoir hose from the radiator overflow neck.
9. Remove the radiator upper support brackets and bolts that connect to the fan shroud.
10. Disconnect the engine cooling fan motors electrical connectors.
11. Remove the cooling fan motors electrical harness from the fan shroud clips.
12. Remove the cooling fan shroud.
13. Remove the outlet hose from the radiator.
14. Disconnect the transaxle oil cooler pipes from the radiator.
15. Tilt the top of the radiator rearward.
16. Remove the condenser hold down bracket from the radiator.
17. Lift the condenser from the mounting tabs on the radiator and position the condenser aside.
18. Remove the radiator.

When you mention the radiator having a hot upper in pipe and a cool bottom out pipe tells me that the coolant is not moving around the engine. This could be down to a water pump not working, blocked radiator, thermostat not opening. The bottom hose should be cooler than the top hose but once the engine is up to working temp which is around 85/90 degrees c for an audi the bottom still should be farly hot to touch. Hope this helps