2004 Ford F-150 Heritage Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2004 Ford F-150 Heritage
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2004 Ford F-150 Heritage ProblemsBlower Motor Only Works on High
The Ford F-150 Heritage with manual temperature and fan controls may have problems with the the blower motor only blowing air on certain settings. Most commonly the fan will only run on the highest setting. This is a well documented problem, and is caused by a failing blower motor resistor.
Correcting the problem is straight forward, and requires replacement of the small resistor. The resistor is normally found behind the glove box, next to the blower motor.
There is a technical service bulletin for the V8 engines regarding a possible problem with the spark plug being ejected from the cylinder head, damaging the threads in the spark plug hole. If the vehicle is under warranty, cylinder head replacement is recommended. If the vehicle is out of warranty, Ford authorized the use of a specific thread insert to repair the head.
Intermittent rough idle may be caused by the EGR sensor sticking, causing the EGR valve to stay slightly open. Our technicians tell us the valve and sensor must be replaced together to correct this concern.
2004 Ford F-150 Heritage QuestionsI have codes po171 & 174 again. (3 answers)
Its been checked with smoke and nothing. It runs great but when im on the hwy for awhile and push the peddle to the floor it just goes flat nothing no power. I changed the fuel filter, plugs and pcv hose it had a hole in it. I reset it and the light comes back in about 10 miles or so. Code 174 al...
Reset and it comes back with in 15 to 20 miles. It was 1 and 2 now just 2.
Im not sure were to go with it now? The truck should run bad but it runs great. Ive reset the codes and any place from 15 to 100 miles I get the check eng lite again with the same codes P0171,P0174 lean bank 1 and 2.