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Thread: Heat in truck not working.

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    Full Access Member skintbackfarms's Avatar
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    Default Heat in truck not working.


    New to the site and new to Ford IDI's. Just got a 91' f-250 tonight and the heat don't work inside. It has a/c and the truck ran fine. Seems like the engine temp heated up. Also i tried it with the fan on and in the vent section. Your help would be thanks.

    The truck is a 91' F250 2WD long box 5spd. Thanks

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    A Diesel Nut dieselman21585's Avatar
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    I'm suspecting a plugged heater core, but, I'm just one person. Get other answers from other folks on this site as well, before fixing the problem. Also, does the heater core leak coolant into the cab?
    1989 Ford F-250 XL, diesel (duh), 4x2, 5 speed, 3" striaght pipe to a 6" stack, cut out the soup bowl, K&N Air filter, SACHS SMF 12" clutch, 3.55 tagged 4.10 (CURSES!); , 265-75/16 Firestone HT's up front, 285-75/16 Bridgestone Dueler A/T Revo II's out back, my first diesel, purchased with 78,206 miles on it, owned since 23 Feb 05.

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    Full Access Member NJGearhead666's Avatar
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    did you check under the hood to make sure that coolant is going to the core? maybe its bad and they bypassed it. good place to start.
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    Supporting Member typ4's Avatar
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    Check the vacuum pump, controls work on vac. It does default to defrost. blend cable could be messed up also.
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    Full Access Member skintbackfarms's Avatar
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    Thanks for the answers. Everything is hooked up under the hood but the brakes don't work right . The guy said the vac pump was bad so I'll will try that today and see.

  6. #6
    be nice to the admin :D subway's Avatar
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    yea a bad vacume pump can make the brakes funny and weak. dont use a gear puller on the pulley! you need a power steering pump pulley remover to do it right.

    might want to check it first if you can, it not only has to pull a good vacuum but keep it after pumping the brakes a couple of times.
    Jared, the artist formerly known as Jred on the board. Be kind to the mods, they are all powerful!

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