Why would my Top Radiator Hose collapse? - Chevelle Tech
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post #1 of 4 (permalink) Old Oct 19th, 11, 9:36 PM Thread Starter
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Why would my Top Radiator Hose collapse?

Why would my Top Radiator Hose collapse? Like sucking through a straw with the end closed.

My fluid level is good and my thermostat is good. No overheating issues.

Do I need to bleed the system, or what?

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post #2 of 4 (permalink) Old Oct 19th, 11, 10:17 PM
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Re: Why would my Top Radiator Hose collapse?

Try changing your radiator cap. This happened to me before and changing the cap did the trick.
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post #3 of 4 (permalink) Old Oct 19th, 11, 10:47 PM
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Re: Why would my Top Radiator Hose collapse?

I went through a couple radiator caps before I got mine to stop collapsing. I ended up getting a Stant cap from Rock Auto that seems to have done the trick. Mine would only collapse after I turned the car off though, not while running as the water pump is pushing on the top hose and pulling on the lower hose.

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post #4 of 4 (permalink) Old Oct 20th, 11, 12:20 PM
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Re: Why would my Top Radiator Hose collapse?

If the hose collaspes after it is shut off (and cools), then the return valve in the cap is plugged, not allowing coolant (or air if no overflow bottle) to return to the radiator. New cap should fix it. Also, if you use any radiator sealer, it can block the cap return. On two different cars I had to flush the cooling system out to remove the sealer, otherwise I was having to replace the caps every couple weeks.

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