Why would hot water leak under steering wheel on driver side?

Hot water leaking under the steering wheel on the driver's side points to a problem with the heater core. The heater core is a small radiator located behind the dashboard that's part of your vehicle's heating system. It uses coolant (a mixture of water and antifreeze) to warm the air that blows into the cabin.

If the heater core develops a leak, the hot coolant will leak into the area behind the dashboard, often dripping down near the steering wheel. This is because the heater core is typically positioned in that area for efficient airflow.

Other less likely, but still possible causes include:

* Leaking hose: A hose connected to the heater core could be cracked or deteriorated, causing a leak.

* Defective heater control valve: This valve regulates coolant flow to the heater core. A faulty valve might allow coolant to leak constantly.

It's crucial to get this fixed promptly. Leaking coolant can damage electrical components behind the dash, and the loss of coolant can overheat your engine. Ignoring the problem could lead to significant and costly repairs. Take your vehicle to a qualified mechanic for diagnosis and repair.