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I finally got the timing chain replaced in the X brand car, and timed and runs real good, except it overheats after 5 minuts of running. I put in a new thermostat, back flushed the whole system, and now the upper rad hose collapses, what the F....... Its an 81 Chrysler 318, and has a new rad (1 month old), head gaskets changed when we first got it (3 months ago). It ran crappy before the chain, and all I did was replace the chain with a stock new set and now it starts and runs great. What causes the hose to collapse???

Rick
 

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I'm not sure on that one Rick, but you could try buying one of the hoses with the spring inside, so it wont colapse.
 

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I have seen lower hoses collapse with out a spring or wire in them because of the pump's suction, but this usually happens at highway speed (higher revs).
The only times I have seen upper hoses suck themselves flat is when there is air in the system.
 

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Air in the system or The thermostst is/was defective... did you test it before putting it in? or a bad cap...
Don
 
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