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Old 05-18-2013, 09:21 AM   #1
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Join Date: Feb 2013
Location: las vegas
Region: Nevada
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Under Hood Insulator

I just ordered a custom fiberglass hood for my 1991 convertable at http://www.latemodelrestoration.com/item/CER-101/1987-93-Mustang-Ram-Air-Fiberglass-Hood-15-Rise

My question is... will I need to put on a "Under Hood Insulator" like the one that's on the original metal hood? Or will the fiberglass hood withstand the extream heat that's put out from the custom headers?

I'm having an overheating issue so I replaced the mechanical fan with an electrical dual fran from a contour. (Obviously I've also upgraded my altenator to a 3g as well) My fans are powered though some relays... yada yada yada.

My 40amp relay (mounted close to the hood on the passanger fender side) burnt out (Melted connector) at the power wire to the fans. I think this is a combination of the headers putting out so much heat and not having a proper ventalation system, hence the ordering of the new hood.

EVERY wire is running hot to the touch, including the possitive battery cable at the battery connection. The aforementioned relay can't be held for more than a couple of seconds without getting burnt.

The overheating is somehow causing battery drain. In other words, when the car gets to hot (3/4 to max range on temp gauge) and I shut it down to prevent damage I can't start it again without a jump. Is this an isolated problem or is it all connected to the heat under the hood?

Sorry for the lengthy post but I wanted to ensure you guys had all the info. Thanks

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Old 05-18-2013, 10:49 PM   #2
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Region: Delaware
Posts: 270
I'm not sure about your over heating issue but some of the ford two speed fans draw over 60 amps on start up. You may want to replace that 40 amp relay with a Bosch 75 amp relay. Also make sure the wiring is of proper gage. Wiring that is too small will heat up and melt if too many amps are flowing through them.
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