Please Help Me

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SPECTRE2147

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I Got A 93 And Think I Need To Replace My Heater Core, She Been Overheating For About A Month Now, And I've Replaced A Lot To Do With The Cooling System, All To No Avail. Im Merely Seeking Some Advice About This This Let Me Go Into Better Detail.

My Car Overheats While Driving, Cools Down At Idle?
I've Replaced The T/s, Water Pump, Radiator, And Temp Sensor To The Gauge.
Ive Taken Off The Intake Tube To Have A Look At The Heater Core Hoses, And Didnt See Any Signs Of Leakage, However I Did Notice That The Hoses Didnt Have The Factory Clamps On Them, What I Need To Know Is How To Replace The Heater Core, So That I Can Have A Better Look At This, Coolant Is Going Somewhere, And Shes Now Putting A Small Spot On The Road When Its Cooling Off At Work.
My 93 Mark Viii Has 64000 Miles On It, Im Hoping Uts Just An Old Hose, But It Doesnt Look Like The Case. Anyone Else Ever Has This Problem?
 
You could try to double-clamp all the hoses. Not the best idea, but that could narrow the leak when it comes to hoses.

If you have a spot, you have a leak location though. You need to narrow that.

If the core was leaking, odds are it would leak into the interior and you would smell it.
 
I would also pressure test the system to find any leaky hoses and go from there. The heater core should be the LAST thing you'd want to do on this car....or any Ford for that matter.
 
Also check the twin speed fan, If its not running on High, aka when driving the hot gasses and fuild will leak out form a failure point.

I faught with that problem until I replaced the fan, and the issue corrected itself.
 
Replacing the heater core is very time consuming; it requires disassembling the dashboard.

Do you actually have evidence that the core is leaking (fog on windows, antifreeze smell in passenger compartment)?

If you go through all that work, and the heater core ends up not being the location of the leak, you're going to end up being really pi$$ed.

You can try bypassing it for the time being. You won't have heat in the car but it may save you a headache.

If the coolant still leaks after you've bypassed the core, you'll know that the heater isn't where the leak is.

The two black pipes at the back of the engine on the passenger side lead to the heater core. Connect them with 1 hose, and see if it still leaks.
 
The last 2 causes of overheating on my own car:

1.Radiator fan motor wore out and didn't spin the blades at full speed. It only overheated when the car sat with the engine running.

2. My last coolant leak was at the crossover tube cap. The o-ring wasn't sealing the system properly and coolant kept escaping at the cap. I replaced the o-ring with a slightly thicker one from Ace Hardware. I lubricated it with Dielec. grease before I tightened the cap. In addition, I rubbed Red RTV on the cap threads and pipe threads before I tightened it down. The problems ended there.

When the system's working properly, during cold months like this, my temperature gauge will read at the bottom of the "L" in N-O-R-M-A-L and no higher than the crossbar of the "A".
 
Well, I Dont Smell Antifreeze Inside The Vehicle, No Foggy Windows, So It May Not Be My Core, I Just Noticed Some Coolant On The Round, Sitting In The Drivers Seat, The Location Would Be Rear Engine, Passenger Side. Any Guesses?
 
Rear passenger side?

Could be heater core hoses - very likely, or it could be the heater core input, it comes off the back of the head. There is an o-ring with that. But usually that part gets "Sealed" up from age.

My bet is on the heater core hoses if thats where the leak is. Get a flash light and look really close.
 
Okay, Im Hoping(not Really) That This Is The Problem, Right Now I Just Wanna Know What The Problem Is, Im Gonna Be More Than Happy To Fix It At This Point.
 
Might save you some time typing if you didn't capitalize the first letter of every word. Just giving you a tip; if caps is what you prefer then by all means...
 
Well the caps were getting annoying ;)

Well let us know what you find. I sorta hope is is the heater hose, then you know where the problem is. Then again, I hope not since they are a complete pain to replace. Damn Ford for designing this car around a V6!
 
Unfortunately yes. The entire MN12 platform was built for a V6 - fuel economy in mind. But competition for Cadillac and such forced for to play the modular card and the "all new" 4.6L made it in almost at the last minute.

This is why working on it can be rather difficult. The heater core, oil filter, throttle body, etc.... Also the reason for the tight clearances everywhere else.

Needless to say, I would rather have to "put up" with a V8 shoed in there than a V6.
 
No doubt considering the curb weight, it would be a dog, unable to escape its own shadow, just like my xB.
 
Just do like JMILES T said and by-pass the the heater core to elimanate the heater core, go to the auto parts store an buy a 12in peice of 1/2 heater hose and conect in inlet with the oulet.
 
does your car have the air deflector under the bumper? If not this could be why it heats up while driving.
 
Lol. Im only at around 10,000 points :mad: My wife is good at it though! :)
 
This is very odd...

Overheating when driving, cooling down when idling. And you're puddling on the ground... Plus you've replaced your thermostat, radiator and temp sensor... That sum it up?

Okay, so... I think the first issue to address is your leak. Try to trace it up from the ground. You could have a manifold leak (check on the back side if you can; see if it's damp), leaking hose (although I think you'd notice that). I'd be surprised if it's your heater core given the fact that it's dry inside your car, lacking the sweet smell of glycol.

Also, throw a new cap on your system. It's essential that the correct pressure be maintained in your system for it to work at top efficiency.
 
try the cap. also might want to check for engine compression in the radiator, for example blown head gasket.

had a problem on a mustang and took us a while to figure it out, we were getting combustion products in the coolant. easy to fixxor. good luck.
 
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