Evaluation your heater core for blockages or leaks whether you suspect a heating botheration.
The heater core in a 2002 Mercury Sable is a little troop of pipes and cooling fins that looks somewhat enjoy a radiator. The heater core is located last the sprint and the inlet and Issue pipes protrude washed-up the engine firewall on the passenger side. The heater core works by receiving the engine's hot coolant and dissipating the heat through the dashboard vents with the help of a blower fan. Over time, the coolant passages of the heater core become blocked with debris or fail, causing leaks, and the unit and must be replaced.
Instructions
1. Disconnect your vehicle's negative battery cable and straighten your steering wheel position so the wheels of the car are pointed dead ahead. Make sure the steering-wheel locking mechanism engages and wait one minute before moving on to the next step.
2. Remove the dashboard assembly from the vehicle. You will need to do this so you can gain access to the heater core and create enough room to remove it from its mounting location. (See Resources and Tips section for ways to obtain detailed parts diagrams and disassembly instructions to perform this step.)
3. Locate the two coolant hoses connecting to the heater core, leading to the passenger side of the engine's firewall, inside the engine compartment. Pinch off each of the heater-core hoses with a pair of locking hoses to prevent coolant from leaking.
4.5. Remove the heater core from under the passenger side of the dashboard. (Refer to the Resources section below on cut off a portion of unneeded metal underneath the dash that will make removing the heater core easier. This extra piece of metal was used during the robotic assembly process and no longer needed by the vehicle.)
Loosen both of the hose clamps retaining the heater-core hoses to the heater core. Grip each hose and use a twisting motion to back the hoses off the heater-core inlet and outlet. Prop each of the heater-core hose openings upwards to reduce the chance of coolant leakage.
