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I have change cap 3 times also upper hose, thermostat, and water pump nothing changed still collapsing when cold
 

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I have change cap 3 times also upper hose, thermostat, and water pump nothing changed still collapsing when cold
Have you checked your over flow hose for blockages?

If no blockages there remove the radiator cap and the metal disk on the bottom it should pull down easily if not then its not letting air to vent back into the radiator which is causing the collapse which is nothing more than vacuum being created in the cooling system after pressure vented out when hot.
 
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