One problem related to blown head gasket has been reported for the 2003 Ford F-150. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford F-150 based on all problems reported for the 2003 F-150.
In between oil changes, the sender assembly in my Ford f150 failed to send a message to the gauge that the engine was overheating. Because of that failure, both head gaskets were blown allowing water to go inside the engine. The sender assembly was not working so it did not send a signal to the oil gauge that the pressure was low. This caused a complete engine failure. Cost to replace the engine was $5,405. 12 + 20 days of a rent car $672. All of this out of my pocket and Ford refuses to reimburse me as does the dealership who did the repair.