Vacuum in the radiator hose

[Ironman24]

Anyone ever experience this? I'm stumped on this one.

I thought my hoses were worn out because they had colapsed. The car would stay in the 220 range with lack of coolant flow from the restriction. So I replaced the hoses, took the car out and the next day I open the hood and the upper hose is totally flat. When I opened up the bleeder valve it sucked air in and expanded the upper hose back into place.

This can't be normal.

[Wicked 3800 V6]

Miiike Miike this is your engine .. . bleeeeeeed me ... Maybe your thermostat is frozed / stuck shut?
-Rob

[Ironman24]

LOL, that's the general consensus I'm getting from the ppl I've been chatting with.

I just rememberd the Hypercheese 160 thermo was my first mod about 5 years ago, guess it might be worn out. ;)

[Dominic]

If its sucking down flat perhaps you need a new hose or more coolant in the system? The system should be pressurized, not under vacuum!! thats pretty funny though [img]smile.gif[/img]

[Magnus]

Wow, vacuum is odd.

I'd say it has to be either thermostat or radiator cap.

[Ironman24]

I just put new hoses on the car, I thought that was the problem. Then on the first run it sucked the top one flat again. I ordered a new thermo, will replace that and then see what happens.