CT54531

On my '87 Vette, the short u-shaped small coolant hose just below the throttle body is held on by clamps I've not seen. Round (of course) around the hose but a square on top with the tightening(?) screw down through the square. Even with the screw backed all the way out...stays locked tight. It looks like small triangular flanges have been pressed down on the corners of the square to hold in place. But I can't budge it and it pains me to admit I can't figure it out - except to just cut the whole %#@&*&# thing off.
BTW, came up to this as I as heading to replace what I thought was a leaky water pump but this same hose has a hole in it I hadn't seen before. So the fix for the leak may not even require the new pump. But as for that &^%##* CLAMP....
Excuse the language :-)

aklim

This? I'd just cut it off. I suspect the rubber is holding the clamp. If you want to be careful, take a set of pliers and CAREFULLY turn it side to side to wiggle it

Churchkey

Back the screw off then use a deep well socket or short length of metal tube that will go over the hex of the bolt & contact the rectangle, tap the tool to push the clamp open.

s carter

I use to use a 10mm tube on a 1/4" drive smack it loosens no Sweat No%$#@%^&%#$#

Cliff Harris

Those clamps are specially made by GM to put even pressure on the hose and not dig into it.

CT54531

This clamp:

aklim

Looks like it is now part of the hose after all the years of being squished together. Change the hose and cut it off

woody3882

At this point you are better off just cutting it off with a grinder, but the way it works is when you screw the head down/clockwise it puts pressure on the inner ring of the clamp. This pushes the inner ring in and forces the outer ring out thus closing the clamp. Back the nut all the way out, if tapping it does not set it free, then take a pair of channel locks and twist it, regardless, junk it and replace it with a better one
Woody

jedapete

I just replaced my hose and put on new worm gear clamps always easy to take off and put back on. Jedapete

daustin

Those are called "tower" clamps, standard GM issue for decades. My trick to get them off is to loosen the bolt, then take aflat blade screwdriver, insert into the bottom under the tower and slightly wiggle. It should loosen right up.

Don