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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Running Hot

Old 04-26-2005, 07:59 AM
  #1  
stangcrazy
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Default Running Hot

I drive a 89 GT I changed my water pump last year due to an overheating. I have noticed recently that I am losing alot of coolant. After running it for a few minutes and turning it off I hear the sound of water being poured on a hot surface. I cannot notice any problems with any hoses. I am wondering Where I could be losing all this water from. My heater core is bad and I donot have it bypassed. I am not sure if that could be causeing the loss of water. I wouldn't think so since my passenger floorboard is dry. The coolant was filled a week ago and tonight when i went to get food my water pump started making noise and i noticed it was running realy hot. When I returned I let her cool down and checked water again and is was bone dry. Any help would be great.
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Old 04-26-2005, 10:30 AM
  #2  
mustang8719
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Default RE: Running Hot

Look on the firewall on the passenger side.If the heater core is bad it should leak out of teh drain in the firewall.Then it will drip onto the exhaust.Do you have coolant or water in there.
If you have coolant it should be easy to trace.Water evaperates fast.Coolant doesn't evaperate so you can trace it.
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Old 04-26-2005, 11:01 AM
  #3  
Djs94stang
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Default RE: Running Hot

If the heater core is leaking it will steam up your windows and you'd smell it.
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Old 04-26-2005, 11:03 AM
  #4  
Djs94stang
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Default RE: Running Hot

I noticed you are in Arizona....are you running the AC? The sound you here could be the water from the evaporator dripping on the exhaust and be totally a coincidence.
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Old 04-26-2005, 12:02 PM
  #5  
stangcrazy
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Default RE: Running Hot

At the moment it is Water. And i am not using the A/C.
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Old 04-26-2005, 02:43 PM
  #6  
Pure5.0
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Default RE: Running Hot

Just check everywhere. Pour some antifreeze in that is high in concentration. Example 70% coolant, 30% water. This is just to see where it is coming from. If the coolant is burned it turns brown. Clean your engine and let it dry. Then run your car and after it has cooled look for the brown dust looking cover.

You can also rev then engine when you are under the hood. Just open up the TB and see if any speew out.

I have a slow leak too, but that is because the hose is bad. It is the hose that goes into the firewall from the engine. A crack. I couldnt find it until I got under the hood and revved it. Then it shot out like a water gun. Kind of funny but then again a pain.
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Old 04-27-2005, 03:10 AM
  #7  
stangcrazy
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Default RE: Running Hot

I bypassed my heater core tonight. Going to get on it a little more then normal on my way to work tonight and see how she does.
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Old 04-27-2005, 06:19 PM
  #8  
86gt5.0HO
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Default RE: Running Hot

so whats the verdict, did you fix it?
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Old 04-29-2005, 01:50 PM
  #9  
stangcrazy
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Default RE: Running Hot

Well the verdidct is in. Bypassed the heater core and nothing. Busted out the flash light one more time and found that it was leaking from the newly replaced thermostat... Did a bang up job on that one.... So I removed the thermo and reinstalled it. I guess when I placed the thermostat up to the block it had slid around a little and not been seated correctly. Took my time made sure it was done correct and now it seems to be working like a champ.
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Old 04-29-2005, 07:26 PM
  #10  
Demon_Mustang
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Default RE: Running Hot

niiiice.
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