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Old 08-08-2022, 09:50 AM   #1
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Rats ate through some wiring, can someone identify?

I've been in constant struggle with rats getting into my engine, and as we were on vacation for 2 weeks i found them starting to build a nest. The only thing they damaged was this wire or tubing that is in the back of the engine and runs behind the washer fluid fill. It seems to blow out air when engine is running. Does anyone know what this is for?
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Old 08-08-2022, 11:44 AM   #2
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That's a vacuum line. It's not blowing air, it's sucking it in.
I have not the faintest clue what sort of Ford you have so can't really guess where it goes. On my (probably) older 1993 the red line goes to the fuel pressure regulator on the the injector rail. On other trucks I have seen the red line used to go to the EGR valve and on others to the vacuum reservoir. All I can think of right off. If your RV is a cutaway van type then there often is a very basic vacuum line routing diagram as a sticker on the underside of the hood. If not, relate your exact year, model, and engine and likely someone here can help more.
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Old 08-08-2022, 11:53 AM   #3
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Try your in dash air conditioner to see if it will blow air out of anywhere except the defrost vents.

If it only blows out the defrost vent, that line is going to the vacuum tank under the heater box and then inside to the center top of the dash, where it connects to the control system.
You can't access the vacuum tank without removing the fender so hopefully, you can find the end of the line back there and reconnect it.

You can reroute the line, following the antenna wire, without the tank, just add a check valve.
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Old 08-09-2022, 08:12 AM   #4
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Thanks. It is on a 2017 E350 with the Triton V10
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Old 08-09-2022, 03:18 PM   #5
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I'd find a piece of rubber vacuum hose just big enough to slip over that tubing and a couple of wormgear clamps to splice it back together.
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Old 08-09-2022, 09:19 PM   #6
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So as you suspected, when running the AC it only blows from the defrost. I'm hoping I can open it up behind the glovebox and reconnect the tubing. I may need to pick up some additional tubing and connectors. Damn rats!
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Old 08-09-2022, 09:26 PM   #7
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So as you suspected, when running the AC it only blows from the defrost. I'm hoping I can open it up behind the glovebox and reconnect the tubing. I may need to pick up some additional tubing and connectors. Damn rats!
There appears to be only the one hole in the plastic vacuum tube ; can you remove the chewed section from the rubber boot connector and just cut the section out and re-insert the tube into the rubber ; looks like you have extra length to play with.
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Old 08-09-2022, 09:36 PM   #8
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I also am in San Diego and had similar trouble with the packrats chewing up wiring. If you have comprehensive insurance coverage that should take care of the repairs - at least it did in my case. Also you can call the city's vector control office and they'll send out an inspector to advise on your infestation. It's paid for by property taxes so there is no charge for the service - a very knowledgeable guy came out to help me, left me a trap and gave me some good advice on how to reduce the number of rats on the property. Since then I've had traps by the RVs tires when it's not being used, have had no more damage. Good luck with the battle,
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Old 08-10-2022, 08:52 AM   #9
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There appears to be only the one hole in the plastic vacuum tube ; can you remove the chewed section from the rubber boot connector and just cut the section out and re-insert the tube into the rubber ; looks like you have extra length to play with.
When I tried something like that, I found out they'd glued the tube into the rubber adapter making it impossible to pull out the end they'd stuck in there.
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