Question about 2001 GMC Sierra 2500HD

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Collapsed radiator hose

After going about 10 miles and sitting for a hour, I opened my hood and the top radiator hose was sucked in or collapsed. I started it up and it went back to normal. Is this normal or do I have bad thermostat's?

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Thermostat's bad

Posted on Jan 10, 2009

  • Matthew Stauffer
    Matthew Stauffer Feb 02, 2009

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If the hose has collapsed, most likely the thermostat was put in backwards reversing pressure. There is only one place the thermostat goes. Follow the top radiator hose to the top of the engine block. It will have a round clamp holding it onto an aluminum housing, usually held on by two bolts. On a cold engine, first drain the radiator and squeeze the hose till you don't hardly hear any gurgling noise, unbolt the screws holding the housing, you don't have to take the hose off the clamp. You'll need the new thermostat and gasket for it. Not sure of the type, go to your local parts store and give them the specs on your vehicle. Engine size, how many cylinders, if it has a/c or not. Most likely some engines take a 185 degree thermostat or higher. They'll tell you this. Make sure you remove the old gasket remains from the engine block and the housing before installing the new gasket and thermostat. Use a putty knife. Once it's replaced, refill the radiator. Start the vehicle and wait for it to warm up, watch your temp. gauge or light and turn on the heater all the way up to you feel heat. Approximately 10 minutes tops. Watch the hose if it collapses again or not. You should be good aftger that.

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