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
SOURCE: Air conditioner blows through defrost vents
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
SOURCE: Heater Blower on '95 Ford F-150 XL, Brrrrrrr!
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
SOURCE: my truck will miss and hesitate at highway speeds
Check your fuel filters, many Fords have 2 the second one is mounted on the frame and takes a cartridge.
Posted on Jan 12, 2009
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
SOURCE: what would cause my '02 Camry to hesitate, buck,
Even though there is no check engine light I would still take it to Auto Zone to see if there are any stored codes.
Posted on Jul 16, 2009
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Item
Part Number
Description
1
18A318
Vacuum control motor-floor/defrost door
2
-
Defrost air flow
3
18A478
Floor/defrost door
4
18476
Heater core
5
19860
Evaporator core
6
19805
Blower motor
7
-
Outside air inlet
8
19A813
Air inlet door
9
18A318
Vacuum control motor-air inlet door
10
-
Recirculated air inlet
11
18B545
Temperature blend door
12
18A559
Panel door
13
-
Panel air flow
14
18A318
Vacuum control motor-panel door
15
-
Floor air flow
16
-
Vacuum from the engine intake manifold
17
19A563
A/C vacuum check valve
18
19A566
Vacuum reservoir tank and bracket
19
19980
EATC control
Item
Part Number
Description
1
White
Air inlet door
2
Yellow
Floor/defrost door
3
Red
Floor door
4
Blue
Panel door
5
Black
Source vacuum
6
-
Not used
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