Some Ford Escape owners report experiencing engine smoke and odors in the cabin when the heater is on, which may indicate several underlying issues. These owners have noted a burning smell from the engine, potentially signaling problems with the cooling system or overheating. Additionally, when the AC is activated, some report a burning smell from the air vents, possibly due to an overheating blower motor or its resistor, which can lead to burning plastic odors and white smoke. Others have detected a slight exhaust fumes smell when using the heat, which could be related to issues with the EGR valve or housing. Common causes for engine smoke include overheating, burning oil, or a melting wiring harness, prompting caution around the engine when hot. Furthermore, some owners have continued to notice cabin odors even after replacing the blower motor resistor and cabin filter, suggesting that the AC compressor may not be engaging properly. Lastly, a strong gasoline odor after parking and a burning plastic smell when revving the engine may indicate fuel-related issues or component problems. It is recommended that affected owners have their Ford Escape inspected by a qualified mechanic to diagnose and resolve these concerns promptly.