I have a pin hole leak in the rubber hose section of the lower heater hose... I wanted to cut it at the leak and replace the whole section to the water pump with rubber hose... But it has this short crimped section(#13) I've pointed out in the link below... I got the pic off shoebox's page, but I can't seem to find the name of the part for the # listed on his site... Anyone know what it is?

Link

 

heat core flow control valve. it controls the direction of the coolant. a oneway flow valve.

 

Ah, thanks... I guess if I replaced that entire hose I'd screw up the flow through the heater core.. Oh well.

 

There have been people that have removed the flow restrictor and not reported any problems. I'm not advocating removing it, just letting you know what others have done.

 

i blew mine out in a 96z28 and replaced it with a metal pipe and had no problems at all

 

its there so at high rpm's the heater core isnt stressed, i wouldnt remove it

 

You can order the "valve assembly" from a GM dealer. Just cut the old one out and clamp the new one on. It's part# 10188036, about $16.00 from a dealer.