I just went through the process of replacing all of my coolant hoses, just as a precautionary measure due to age. I had a bit of trouble finding all the part numbers so I’m making this thread to help out the next guy. This is for a stock 3-Door '93 GS-Leather with a B18A1 and a 5 speed Manual (the non-California emission spec KA5MT), but probably applies to most DAs although automatic transmissions may have a few more hoses, not sure. I decided to go with all OEM parts because some of these hoses have some complex bends and I didn’t want my hoses kinking because I used generic hose. When looking at an OEM Acura parts website the sections you need to look in are called “Radiator Hose”, “Water Valve”, and “Water Hose”. “Radiator Hose” are the largest hoses connected to the radiator, “Water Valve” are the medium size hoses running to the valve and heater core beyond the firewall, and “Water Hose” are the smallest hoses running to misc places like the throttle body. Below is the diagram for each section followed by the item number on the diagram, (the part number), the part name, and the price I found online for each. You need one of each part below. I reused the clamps, but if you cannot, you will need to take that into account as well. If you don’t need every hose replaced refer to the diagrams to find the part number you need. If you are going to replace all coolant hoses see the very bottom of the post for a complete list of all the part numbers.
Radiator Hose
#10 (19501-PR4-A00) HOSE, WATER (UPPER) $18.56
#11 (19502-PR4-A00) HOSE, WATER (LOWER) $32.68
#13 & #12 {both are the same part #} (Clamps not hoses) (19511-PH7-003) CLIP, HOSE (36.5MM) (CHUO SPRING) $4.63 each (you only get 1 clamp per part number you order and you will need 4 total clamps)
Water Valve (Heater Hoses)
#2 (79721-SK7-A00) HOSE A, WATER INLET $19.84
#3 (79722-SK7-000) HOSE B, WATER INLET $4.56
#4 (79725-SK7-000) HOSE, WATER OUTLET $13.14
#6 (Clamps not hoses) (19513-PE0-003) CLAMP, WATER HOSE (21.7MM) (CHUO SPRING) $4.16 each (you only get 1 clamp per part number you order and you will need 6 total clamps)
Water Hose
#1 (19506-PR3-000) HOSE, ELECTRONIC AIR CONTROL VALVE IN. $3.30
#2 (19507-PR3-000) HOSE, ELECTRONIC AIR CONTROL VALVE OUTLET $6.29
#3 (19508-PM6-000) HOSE, BYPASS OUTLET $5.34
#5 (19521-PR4-A00) HOSE, WATER INLET $2.09
#6 (19521-PR3-000) HOSE, WATER INLET $2.05
#7 (19527-PR4-A50) HOSE A, BREATHER HEATER $6.29
#8 (19528-PR4-A50) HOSE B, BREATHER HEATER $3.15
#9 (Clamps not hoses) (95002-41250-04) CLAMP, TUBE (D12.5) $1.07 each (you only get 1 clamp per part number you order and you will need 12 total clamps)
#4 (Clamps not hoses) (19513-PE0-003) CLAMP, WATER HOSE (21.7MM) (CHUO SPRING) $4.16 each (you only get 1 clamp per part number you order and you will need 2 total clamps)
The total cost for all hoses plus shipping was $121.80. I used http://www.acuraoemparts.com/ cause they seemed to be the cheapest at the time that I did this. I suggest you google part numbers and see if you can find anywhere cheaper, or you could save on shipping and wait time by walking into your local Acura dealer with the list of part numbers.
[B]Part Number Lists:
All Hoses Part List[/B]
19506-PR3-000 (x1)
19507-PR3-000 (x1)
19508-PM6-000 (x1)
19521-PR4-A00 (x1)
19521-PR3-000 (x1)
19527-PR4-A50 (x1)
19528-PR4-A50 (x1)
79721-SK7-A00 (x1)
79722-SK7-000 (x1)
79725-SK7-000 (x1)
19501-PR4-A00 (x1)
19502-PR4-A00 (x1)
All Clamps Part List
19511-PH7-003 (x4)
19513-PE0-003 (x8)
95002-41250-04 (x12)
Thermostat
19301-PAA-306 (x1)
