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Yes you can run the engine without the sensor, maybe. When you disconnect the sensor the computer uses a signal or number preset in the computer memory. Sometimes the engine will run and sometimes not, but it won't do any damage either way. A mechanic would test the sensor by using a meter and a vac pump. The sensor measures engine vac. You could always try a used part.
Heater blower? Well it's either the switch or the blower motor. Probably the motor if you use heat or AC often, and it's happening intermittently. Test the motor with an outside power source (like another car battery), I bet it acts screwy. It may just be dirty, depending on where you drive, or some small animals could have made a home in there. Hopefully nothing has come undone in your dash, that's a mess.
Go pick up a $20 Chilton or Haynes manual for your truck, that will help greatly, it's worth the cash.
The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.
this may be your heater motor or a blower motor resister that went bad the bower motor resistor controls the speed of the blower if the speed settings went out one by one or if you only had one setting this could be the resistor
the heater fan relay should be in the fuse panel. if not ck see if there is a regular fuse too. Who was messing with the car to do that? find the heater blower switch which should be by the radio... and sometimes it is easier to just take out the radio to get more room. check the wiring make sure nothing else is hooked to it . do the same for the blower which may be easy to get to under the pass side dash or thrught the glove box. but check the wires.
warm your car up to temperture. Grab the upper rediator hose. Is it warm or cool. If its cool your thermosat is stuck closed and thats why you have no heat. If that works fine I would look at your heater core next.
you have the exact same problem i did. there's vacuum tubes behind the control panel (if i remember correctly the tube i had was black) and it will most likely be hiding down in your mess of wires as mine was, and you'll either need to photograph the tube and the vacuum connection hub and i'll walk you through what to do with it, or you can buy the haynes jeep manual for your specific year and style and it will be under cooling, heating and air conditioning systems (3-13) if you get the 1993 thru 2004 manual.
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