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.

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Old 05-10-2006, 10:23 PM
  #1  
Shifty5.0
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Default Hot

So, with the new heater core in w/ new hoses im overheating. it was the same amount of heat that my old one produced so... my thermostat is bad, or the system is plugged right?

could anything else be going wrong?
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Old 05-10-2006, 10:29 PM
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silver91gt
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Default RE: Hot

there may be an airlock in the system.
did you let it run without the rad cap on untill all the air bubbles came out?

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Old 05-10-2006, 10:34 PM
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FiveLiterRiceEater
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Default RE: Hot

thermostat most likely. but burp it like silver said just to make sure. dont let it get too hot though.

if it still over heats after you burp it its probably time for a thermostat.
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Old 05-10-2006, 11:13 PM
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smkshw
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Default RE: Hot

I would say airlock,because if it didn't do it before,there's no reason why it should do it after the heater core,it just happed to me when I replaced my water pump,I only let it run for a few minites,and it was HOT,until I figured it out..
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Old 05-11-2006, 12:29 AM
  #5  
Tims 88GT
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Default RE: Hot

U know it can not be a complete air lock because a temp sensor will not read anything without coolant/water. ither u only have a lil bit of coolant in the motor.Fix would be add more coolant, or your thermo is locked up and you only have whats in the motor.
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Old 05-11-2006, 12:32 AM
  #6  
Liquid_02
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Default RE: Hot

ORIGINAL: Tims 88GT

U know it can not be a complete air lock because a temp sensor will not read anything without coolant/water. ither u only have a lil bit of coolant in the motor.Fix would be add more coolant, or your thermo is locked up and you only have whats in the motor.
Temp sensor will still read it... Heat does transfer

Let it run with the cap off
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