No heat ..

Z-STROKE · #1 (**permalink**) 02-26-2013, 11:45 AM

2002 7.3 4x4 ext cab short bed

I only have heat out of my defrost only on any position floor vent ect.
I replaced my vacume pump an that dint do it so my next guess would b the switch to change from floor to vent has gone out ? And defaulted to defrost
What do you think

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NoRalPh · #2 (**permalink**) 02-26-2013, 11:52 AM

Most often it has more to do with a leak (especially at the Auto hubs) than the pump. You sure it's producing enough vacuum to work the doors?

Z-STROKE · #3 (**permalink**) 02-28-2013, 05:53 AM

How would I determine a vacume leak at the hubs ?
My auto locking hubs don't work so there must b a leak at the hubs ?

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**AgTires4295** · #4 (**permalink**) 02-28-2013, 06:06 AM

A lot of the PSDs dry rot on the hoses just above the hub assembly. Start there and follow them up into the engine compartment

Z-STROKE · #5 (**permalink**) 02-28-2013, 10:57 AM

Will check it out when it stops snowing! Lol

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