Thermostat Hose

Hey everyone, I have yet another interesting problem. After I drive my car for a while, and then let it sit for a while, the upper coolant hose on the engine collapses. Once I open the thermostat housing cap the hose returns to normal, then I top up the coolant in it and carry on my merry way. However, after I drive it again, then letting it sit again, it collapses. The coolant I top it up with just ends up in the overflow tank. First I thought it was the thermostat. So I replaced it, but it still collapses. What do you think is causing this?

On another note, it turns out that for the last two years I've needed a new thermostat. The old one was stuck open and 10 degrees to cold. lol. Thanks.

Oh and sorry for the horrible grammer, I just got home from a closing shift.

I agree with Marcel, for the price change both, the themostat and even go to GM and buy the overflow cap as I posted a few months back...made a huge difference.

Remember too, that almost ALL places will sell you the wrong radiator cap (the one up front).

If they tell you it's a 10231, get a 10230 (or the other way around! I can't remember anymore).  You can tell if it's the correct one by holding the cap so the seal points down.  The "dingle valve" in the middle should NOT hang down - it should be yanked up by spring tension.  You can hook it with a fingernail and it'll easily pull up, then get snapped back down when you let go.

Another thing to check for, is that the hose going from your puke tank to the rad isn't dying (collapsed, etc).

We'll assume you have no overheating issues?

It seems to be a globally wrong listing.  It's wrong in all Dayco catalogs, so...  the error just gets perpetuated. It's incorrect for all years of Fieros.