Question about 2004 Ford F150
Cannot get the heat to switch from defrost to heat or dash (vise-versa) without turning off the ignition. Blower speed settings work good, lots of volumn. Truck takes a long time to warm up but stays warm (even at -30C temps). Also suspect vacuum issue as the truck has some hesitation/bucking at highway speed at steady throttle position (noticeable at 110km to 120km per hour)
You have a vacuum leak that is not only affecting motor operation but also the correct operation of the vacuum switch controlling your damper. Need to have that matter resolved -check all vacuum hoses and fittings for integrity/tightness. Vacuum switch itself might be leaking!
Posted on Sep 02, 2017
LOOK AT THE WHITE PLASTIC HOSE GOING TO THE RECIRC VACUUM ACTUATOR UNDER HOOD. THIS IS ON TOP OF A/C BOX BY RIGHT SIDE OF FIRE WALL YOU WILL FIND THIS HOSE IS STARTING TO COME APART REPAIR HOSE AND PROBLEM FIXED.
Posted on Sep 13, 2008
could be your thermostat, thats quick and easy and cheap. could also be your water pump, not easy or cheap. could also be your heater core, also not easy or cheap. but i would start with the thermostat, chould cost you less than $10 for the part, and maybe an hour or two to do it yourself. if that doesn't help i would probably do a radiator flush, preferably a pressurized to get all the gunk our of it, and you'll probably have to go to a shop for that and cost you around $100, and they will tell you what the problem is, whether its your pump, your core, or you could even have a cracked radiator. and if thats the case, after you have it flushed get some of that radiator seal stuff, you just put it in your cool radiator(not the resevoir) and the the engine run for an hour or so. not a permanant fix, but this could all get you a little extra warmth.
Posted on Dec 23, 2008
Yes vachum controls all the doors on it go to http://www.alldatadiy.com and buy a subscrption there for your car they will have all the parts location for you there, most likely the blend door vac. motor is bad.
Posted on May 28, 2009
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