Electrical 1989...heater core out

justin82 · Dec 8, 2018

really dumb question?
wanted to drive my car a few times...core is out, no heat...stock alternator...a portable heater that plugs into the cig outlet....good or bad idea
thanks!

jrichker · Dec 8, 2018

You will run out of electrical power before the heater starts to put out much heat...

Figure this:
Ignition system & computer = 12 amps
Fuel pump = 12 amps
Exterior lights = 15 amps
Fan (heater or A/C) = 15 amps (can run between 5-25 amps depending on setting)
Radio & instruments = 10 amps
Wipers = 10 amps
Rear window defroster = 5 amps (optional, not found on most southern fox mustangs unless the car moved down with the snowbird owner…)

That's grand total of 79 amps from a 65 amp alternator. Talk about overdrawn at the bank!

Its time to either replace the heater core or upgrade to a 3G or 6G alternator. See the link below for the how to do it the right way...
http://www.stangnet.com/mustang-forums/threads/3g-alternator-install-a-how-to.646825/#post-6673702

justin82 · Dec 9, 2018

thanks man....those are the numbers I've always wondered about, just wasn't sure how to ask in a question...worded great man!...ughhh heater core is something I definatly dont want to do....thanks for the info!

Mstng93SSP · Dec 10, 2018

Heater core is not a bad job to do. Everyone always talks like it's a 10 hour job and it's not. I had my dash out in less than an hour. Total time start to finish on the heater core (I have done both of my foxes) was a little over 3 hours. Latemodel Restoration has a pretty good step by step video.

justin82 · Dec 10, 2018

looks intimidating...seen the video, ughhh

jake90lx · Dec 13, 2018

justin82 said:
looks intimidating...seen the video, ughhh

I would not be organized when i have that dash out, glad mine doesnt leak

Noobz347 · Dec 13, 2018

justin82 said:
looks intimidating...seen the video, ughhh

There are lots of pieces and parts. Take your time, take lots of pics with your phone as you pull it apart. You can refer to these if you get stumped putting it back together. Take pics of any electrical harnesses or linkages.

It's not tough. Once you do it, you'll wonder why you sweated it so long. If you modify the box while you have it apart, it will be really easy to get back in but you'll never have to. LoL

Mustang5L5 · Dec 15, 2018

Dash isn't a big deal. Hour or so and once you do it once you can do it again faster.

Once you are there, core is no big deal. It's the evaporator that's a pita

Alley Oop · Dec 15, 2018

I've done it on a 1990 Mustang. It was a slow, slow process for me but it sure felt good when it was completed.
Take lots of pics and label as much as you can as you go along. It was nice, not to have to guess with the
re-assembly.

justin82 · Dec 15, 2018

thanks guys!!!

General karthief · Dec 16, 2018

A nichols worth of free advice, when attaching plastic parts just snug the screws, I put a small dab of silicon on the metal where the screw goes and just snug the screws. I've come across too many broken plastic pieces that were just over tightened, the silicon helps with the dreaded plastic rattle. Just don't use gasket maker, clear or blue will stay rubbery and not harden.

Electrical 1989...heater core out

justin82

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jrichker

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justin82

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Mstng93SSP

You have a nice rear end there Dave.

justin82

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jake90lx

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Noobz347

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Mustang5L5

That is…until I whipped out my Bissell

Alley Oop

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justin82

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General karthief

wonder how much it would cost to ship you a pair

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Electrical 1989...heater core out

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You have a nice rear end there Dave.

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Stangnet Facilities Maint Tech... Er... Janitor

That is…until I whipped out my Bissell

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wonder how much it would cost to ship you a pair

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