Truck heating system changes from heat, defrost, and vent I have a 2001 GMC Sonoma 4x4 with a 4.3L engine. When the truck is under load the heating system will change from heat,defrost, and vent thats
...is not wet with oil ( that indicates a leak ) change all orings receiver drier flush system change orifice tube add oil evacuate the system with a vacum pump to see if it holds vacum then fill ...
...have a pic but can tell you that its connected to both the air intake and the exhaust system could be electrically operated or vacum but i would be expecting it to be staling if this was open a ...
...system seems to have stopped. I checked the obvious like fuses but I'm stumped. Any ideas ????? Tks Bob I would check the vacume lines to the light or check the vacume pods on the lights might be ...
...vacum leak the break system uses an air diaphram to help assist on the power side of the breaking system go to how stuff works .com and look up how breaks and mastercylinders work it will explain how ...
...air leak need vacume diagram for a 05 f150 supercrew Ford does not have a vacume diagram for this system , the vacume has only two lines, one from the engine to the solenoid and one vacume harness ...
...Check for vacum at the heater control ports behind the dash and for vacum leaks. For safty reasons the system is designed to go to defrost mode in case you lose vacum to the system. Hope this
...vacum line back to it's source and or replace it. The Haynes repair manual for your vehicle will be able to assist you further and provide pictures and diagrams of teh system to follow. Could be the ...
...system? I would think the power brake booster has failed, do u hear any hissing when u press the brake pedal? some how the brake booster is not getting vacum or holding vacum. check the hose at the ...
...system. look for cracked vacum lines that seem to be sucking air when engine running at idle speed. in park. the modulator valve [usually] located on the drivers side,of the transmission,is the main ...
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