what is the hose called coming from the water pump to the heater core?
it has metal clamps on it.

part numbers?

 

The hose on the left is the Heater Outlet hose. The one on the right is the inlet hose.

Be a bit more specific. The hose have many parts and lots of clamps.

 

its the hose on the right. I have part number 10236039 which includes the first part of the heater outlet hose but not the second.

 

Year of car? And there are 6 heater hoses on these cars.. which one:
93-4:
http://shbox.com/1/heater_hoses_93-94.jpg
95-7:
http://shbox.com/1/heater_hoses.jpg
from shoebox' site..

 

94 camaro z28 a4

it looks like hose number 11, 12, 13, 14, 15

that whole assembly thing.

 

Refer to this diagram:
http://shbox.com/1/heater_hoses_93-94.jpg

GM 10236039 [which you say you have?..] is the 'hose heater inlet and outlet' assembly and consists of: # 3,4,5,7,12,13,14,15,16,17,20,21

Those should all be included in GM 10236039? [see above] except #11 which is a clamp, [you can use a regular stainless worm type hose clamp]

#12 is GM ' heater inlet front hose' GM p/n 10188037 goes from the 'heater
water flow control valve' [by the water pump] to the 'water pump lower
passenger side inlet fitting'

#13 is the 'heater water flow control valve' GM 10188036

#14 is just a plastic hoop that doesn't do much, and you should already have..

#15 GM 'heater inlet front hose' GM p/n 10146991 goes from the 'lower 3/4" front heater line inlet pipe' to the 'heater water flow control valve' by the water pump [that the '3/4" elbow' goes into, on the other side of that valve]

#16 is also a clamp, you can use a regular stainless worm type hose clamp....

The clamps on the stock unit are swaged on aluminum but can be Dremeled off carefully[ be careful the hard pipe is also soft aluminum] Just slit it some then put a screwdriver in and twist it to finish the splitting off..

If what you mean is that #12 or #15 are leaking, or the #13 flow control valve broke, then you can Dremel off #16 and the 2 clamps on the flow control valve and just replace those 2 hoses or the valve with above GM p/n's [or even use pieces of 3/4" heater hose..]
I did that when I changed to the Goodyear Hi Miler kit[ and also upgraded to 95-7 hose configuration]
That kit is missing #15 hose and I used reg 3/4" heater hose for it..

Still a little confused how you have the whole assembly [GM 10236039] but still need 11,12,13,14,15?

 

[QUOTE=BUBBA]The hose on the left is the Heater Outlet hose. The one on the right is the inlet hose.

Is that if you're facing the front of the car or facing the rear of the car?