Heater core problems in 99-04 gts

1990StangGT · Nov 16, 2005

I am not for sure if anyone else has had tons of problems with this but I sure as hell have. I have a 99GT and since I have owned lets say I have replaced maybe 7-8 heater cores. And is the same thing over and over agian, does fine until the heat is cranked then the stupid thing starts smoking the windows over and leaking drops of antifreeze threw the heater ducts on the driver side. Now I will bypass this and park it for the winter but it sadens me that I will have no damn heat. And I grounded it becasue of the electrosis problem I was told was wrong with it but it did not seem to work. So does anyone of you genius modular guys have a explanation for wtf my car is doing this? If so I would apprciate it so very much.

sgarlic · Nov 16, 2005

What kind of sealant are you using when you put the heater core back in? If you don't use something flexible, the heater core will just crack the first time it tries to expand.

Secondly, if nobody's mentioned this to you, the foxbody's have a reducer piece you're supposed to put in the input hose when you swap heater cores the first time.. I'm not sure if we have one for our style or not.. but it slows down the rate that coolant that can flow in. There's a TSB out there somewhere, but the reducer can be bought from a dealership for pretty cheap.

1990StangGT · Feb 12, 2006

Anyone else have any imput on this subject? I have heard to ground it to prevent electrosis, get this reducer piece, if they make it and where could i find it? And also us a super flexible RTV sealent? Anything else?

Kilgore Trout · Feb 12, 2006

Don't turn up the heat all the way

1990StangGT · Feb 12, 2006

It does'nt really matter. If it is on low they still end up going out.

Kilgore Trout · Feb 12, 2006

What type of antifreeze are you using? Green?

1990StangGT · Feb 12, 2006

[removed insult]

Mike97gt · Feb 12, 2006

WOW 7 heater cores. i have never heard of anything like this. did you pressure test them after you took them out to see where the leaks are coming from.

is something in the blower case hitting the core??

1990StangGT · Feb 12, 2006

I never put them in myself, always had the shop do it. I did see them and it looks to overheating almost maybe that is making them crack. I will check and see if the blower is hitting it as well.

timeless2 · Feb 12, 2006

1990StangGT said:
[insult]

I edited your post. If you want to ridicule, take it elsewhere, please. Thanks.

1990StangGT · Feb 12, 2006

You might want to remove the insult that Kilgore Trout made, I dont think it really helped asking what color antifreeze I use?

Mustang5L5 · Feb 12, 2006

Are they putting in cheapo heater cores or OEM Ford cores??

1990StangGT · Feb 12, 2006

Ford dealership put in a OEM I assume. But the others where ordered from car quest and installed by smalltown mechanic so that could have somthing to do with it. But I can not explain the oem ford one?

bdcardinal · Feb 12, 2006

i had mine go out in october, then go out again last month. i had the dealer do it. luckily it was still covered under warrenty.

Heater core problems in 99-04 gts

1990StangGT

sgarlic

1990StangGT

Kilgore Trout

Fried or Broiled ?

1990StangGT

Kilgore Trout

Fried or Broiled ?

1990StangGT

Mike97gt

it doe snot

1990StangGT

timeless2

Vi Veri Veni Versum Vicus Vici

1990StangGT

Mustang5L5

That is…until I whipped out my Bissell

1990StangGT

bdcardinal

tree hugger

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Heater core problems in 99-04 gts

Fried or Broiled ?

Fried or Broiled ?

it doe snot

Vi Veri Veni Versum Vicus Vici

That is…until I whipped out my Bissell

tree hugger

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