Overheating after radiator replacement

2002 PONTIAC SUNBIRD
158,000 MILES • 4 CYL • 2WD • AUTOMATIC
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SAMANTHA KEELER FRIEND
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Replaced split radiator. Refilled fluids. Previous owner stated they had previously used leak-stop in original radiator. Ran car approximately ten miles and temperature started spiking. Replaced thermostat. Refilled fluids. Ran one block temperature started spiking again. Fan kicks on. But service engine lights are on and temperature continues to spike. Heater is working and throws extremely hot air when on now that thermostat was replaced. Not sure what else could be causing it to overheat. Any suggestions?
Oct 23, 2016 at 1:38 PM
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CARADIODOC
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Have your mechanic perform a chemical test to check for a leaking cylinder head gasket. That involves drawing air from the radiator, (or reservoir), through a glass cylinder with two chambers partially-filled with a special dark blue liquid. If combustion gases are present, the liquid will turn bright yellow.

If the head gasket is leaking, the gas will pool under the thermostat and prevent it from opening. Thermostats have to be hit with hot liquid to open. Hot air wont do it.
Oct 23, 2016 at 2:20 PM
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SAMANTHA KEELER FRIEND
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Thank you.
Oct 23, 2016 at 6:45 PM
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STRAILER
  • ✓ASE Certified Mechanic
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Hi SAMANTHA,

Here is a guide and video on how to test the head gasket just so you know.

https://www.2carpros.com/articles/head-gasket-blown-test

Please let us know what you find so it will help others.

Best, Ken
Oct 26, 2016 at 10:22 AM
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