why does my Genesis G70 overheat in traffic but not on the highway?

Solution

1. Preparation

• Tools Required: Socket set, screwdrivers, OBD-II scanner, coolant tester, thermometer.
• Safety Warnings: Allow the engine to cool before working on the cooling system. Wear safety glasses and gloves.

2. Check and Replace Thermostat

• Sub-steps:
  1. Drain the coolant from the radiator into a clean container.
  2. Disconnect the negative battery terminal.
  3. Remove the thermostat housing by unscrewing the bolts.
  4. Remove the old thermostat and gasket.
  5. Clean the mating surfaces on the engine and housing.
  6. Install a new thermostat with a new gasket.
  7. Reattach the thermostat housing and tighten to manufacturer specifications (typically around 15-20 lb-ft).
  8. Refill the cooling system with the appropriate coolant.

3. Test and Replace Radiator Fan

• Sub-steps:
  1. Start the engine and allow it to reach normal operating temperature.
  2. Observe if the radiator fan engages when the temperature gauge rises.
  3. If the fan does not operate, disconnect the fan connector and use a multimeter to check for voltage at the connector.
  4. If voltage is present and the fan does not spin, replace the radiator fan assembly.
  5. If no voltage is detected, trace wiring back to the fan relay and check for faults.

4. Inspect and Clean Radiator

• Sub-steps:
  1. Remove any debris from the front of the radiator.
  2. Use a garden hose to flush the radiator, ensuring water flows freely through it.
  3. Check for any physical damage or blockages within the radiator fins.
  4. If clogged or damaged, consider replacing the radiator.