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post #1 of 9 Old 07-15-2014, 04:30 PM Thread Starter
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Vacuum Pump Fuse blown

UPDATE 7/17
Rode into town today, turned my ac on first came out of the defrost then started about half defrost half out of the regular vents..... yet the fuse is blown, what could that mean??





Okay had my AC go nuts on me a few weeks ago and only came out of the defrost, after quickly searching through old posts i found it was the vacuum pump and started checking things, noticed the pump didnt even attempt to come on so checked the fuse and sure enough it had bit the dust. Pulled it replaced it everything worked great, yesterday noticed the ac seemed weak, flipped to the floor setting and back to max ac and bam back out the defrost, checked fuse and again its blown....

Question is should i be looking for something specific that is blowing the fuse or just keep replacing the fuse?


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Last edited by Lurch350; 07-17-2014 at 05:48 PM.
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post #2 of 9 Old 07-15-2014, 05:29 PM
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A blown fuse is definitely a sign of a larger problem, especially if it blows again like that. It's possible that the vacuum pump is starting to wear out and pull more amps than it is supposed to, causing the fuse to blow. Could be a loose wire some where. If I were you, I'd start with the pump, though.

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post #3 of 9 Old 07-15-2014, 07:24 PM Thread Starter
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Quote:
Originally Posted by blkdrgn42 View Post
A blown fuse is definitely a sign of a larger problem, especially if it blows again like that. It's possible that the vacuum pump is starting to wear out and pull more amps than it is supposed to, causing the fuse to blow. Could be a loose wire some where. If I were you, I'd start with the pump, though.

how would i go about checking that? or is it one of those replace it and see if it was the problem type things? haha

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post #4 of 9 Old 07-16-2014, 09:18 AM
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I haven't ever toubleshot or priced a vacuum pump, so I'm not sure where to begin with it. I know the Ford dealer where I live will diagnose problems for one hour's labor ($90), and then if you have them fix it, that goes towards the labor charge. You might see if a dealer or mechanic in your area offers the same thing. Or price a vacuum pump and replace it yourself if you think you can and it's cheap enough.

Hopefully someone else on here has more experience with it and can give you better advice!

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post #5 of 9 Old 07-16-2014, 11:50 AM
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Personally i would trace the wires that you can easily first and see if any obvious culprits show up, if not then yea replacement is probably the easiest way to tell for sure. i cant imagine a vacuum pump is too much but like the guy above said never had to

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post #6 of 9 Old 07-16-2014, 11:55 AM
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I had the exact same thing happen to my truck last month. Every time I put the truck in reverse, the fuse would blow, and my reverse lights wouldn't work, vacuum pump and 4wd actuator wouldn't work. That fuse controls the vacuum pump, which actuates the AC and 4 wd, reverse lights ect. Trouble shoot the electrical for everything connected to this fuse, turned out to be the auto tranny position sensor. Everything has been working great since.

Hope that helps.

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post #7 of 9 Old 07-16-2014, 05:17 PM Thread Starter
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Quote:
Originally Posted by blacksheep312 View Post
I had the exact same thing happen to my truck last month. Every time I put the truck in reverse, the fuse would blow, and my reverse lights wouldn't work, vacuum pump and 4wd actuator wouldn't work. That fuse controls the vacuum pump, which actuates the AC and 4 wd, reverse lights ect. Trouble shoot the electrical for everything connected to this fuse, turned out to be the auto tranny position sensor. Everything has been working great since.

Hope that helps.
Well im a 2wd so that at least helps keep one thing away, checked the vacuum pump wires are there no noticable problems, was in the tail lights not that long ago (after the first one blew) no problems there, where do i find the tranny position sensor and how do i know if it is bad?

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post #8 of 9 Old 07-17-2014, 05:48 PM Thread Starter
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UPDATE 7/17
Rode into town today, turned my ac on first came out of the defrost then started about half defrost half out of the regular vents..... yet the fuse is blown, what could that mean??

e99 F-350 Crew Cab, Stock at the moment, 290k+ miles, shes been wrecked, stolen, torn apart. Still trucking and plenty of mods to come her way!
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post #9 of 9 Old 07-18-2014, 05:46 AM
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It means you need to have a professional look at it! Sorry, but I don't know enough about the way the venting system works to even hazard a guess at this point. Somebody else on here might, but you probably just need to bite the bullet and go get it checked out.

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