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ACDelco 251-755 Heater Water Pump

ACDelco 251-755 Heater Water Pump Image 1
ACDelco 251-755 Heater Water Pump Image 2
ACDelco 251-755 Heater Water Pump

ACDelco
Brand:ACDelco
Part Number: 251-755
UPC: 00707773849477
Weight: 0.95 lbs
Condition:New



Availability:
0 in Stock
 OUT OF STOCK

Product Information

Description:

PUMP ASM-HTR COO (SLP)

An ACDelco GM Original Equipment Heater Water Pump is used in some vehicles to pump engine coolant during certain operating conditions. While your engine's main water pump is mechanically driven and stops when the engine does, a heater water pump is electric and able to circulate coolant to the heater core during engine shut off, keeping coolant flowing and the heat going. This original equipment heater water pump has been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors. ⚠ WARNING: Cancer and Reproductive Harm - https://www.P65Warnings.ca.gov

Features and Benefits:

  • GM-recommended replacement part for your GM vehicle's original factory component
  • Manufactured to GM OE specification for fit, form, and function
  • Offering the quality, reliability, and durability of GM OE
  • Thoroughly tested for reliable, leak-free performance

Specifications:

Fan Clutch Included:
No
Height (in):
3.75 in
Housing Material:
Plastic
Impeller Rotation:
Standard
Includes Back Housing:
Yes
Includes Thermostat and Housing:
No
Installation Warnings:
No
Length (in):
8.88 in
Mounting Hardware Included:
No
Outlet Quantity:
2
Programming Required:
No
Pulley Included:
No
Related Cooling Fan Components:
None
Thermostat And Housing Included:
No
Weight (lb):
0.95 lb
Width (in):
4.38 in

Features and Benefits:

  • – A stain around the weep hole is acceptable. However, if a weep occurs with the engine running and the coolant system pressurized, then the water pump should be replaced.
  • – After installation, pressure-test the system for leaks and check for sufficient fan blade clearance between the blade and radiator shroud.
  • – Clean all excess dirt and debris from the water pump housing.
  • – Clean all sealing surfaces, and make sure all old gasket material is removed before installing your replacement component.
  • – Clean and reinstall the coolant recovery reservoir before flushing the cooling system.
  • – Do not use any non-approved flush agents and replace the coolant according to manufacturer's specifications.
  • – Flush the cooling system completely, using power flush equipment or thermal cycling the system with clean water three times. The most effective method of system flushing is to use a coolant exchanger, following the manufacturer's operating instructions.
  • – Inspect for leakage at the water pump outlet housing or the rear cover gasket, and leakage at the water pump vent or weep hole.
  • – Inspect related components in the cooling system, including your fan blades, fan clutch, engine mounts, radiator, belts and hoses, and reservoir.
  • – Never strike the water pump shaft, since this will damage the new water pump.
  • – Run your vehicle to increase engine temperature, and ensure the system is pressurized.
  • – Torque all bolts according to the manufacturer's specifications and adjust belts to proper tension (if applicable) to manufacturer's specifications.
  • – Use sealant tabs only if recommended. Some sealant tabs or similar compounds may restrict coolant flow through the passages of some cooling systems.
  • – With the new pump installed, turn the hub by hand and check for rotation.
  • Before purchasing and installing a an heater water pump, make sure it is the correct fit for your vehicle.
  • Tips for Water Pump Inspection:
  • Tips for Water Pump Servicing & Installation:

Specifications:

Country of Origin:
US

Select a vehicle to narrow ACDelco 251-755 Heater Water Pump fitment info!

Last Updated: 05/27/2023

Years Vehicle Per Vehicle Fit NotesFitment Notes
Chevrolet Trailblazer EXT

4.2L L6 Gas DOHC
1
 
GM Original Equipment
INCL BRKT
A/C FRT AUTO/AUX CONT(CJ2), A/C FRT MAN/AUX CONTROL(CJ3)
Eng: LL8
8th VIN Digit: S
 

Chevrolet Trailblazer EXT



4.2L L6 Gas DOHC GM Original Equipment
INCL BRKT
A/C FRT AUTO/AUX CONT(CJ2), A/C FRT MAN/AUX CONTROL(CJ3)
Eng: LL8
8th VIN Digit: S

1 Per Vehicle
GMC Envoy XL

4.2L L6 Gas DOHC
1
 
GM Original Equipment
INCL BRKT
A/C FRT AUTO/AUX CONT(CJ2), A/C FRT MAN/AUX CONTROL(CJ3)
Eng: LL8
8th VIN Digit: S
 

GMC Envoy XL



4.2L L6 Gas DOHC GM Original Equipment
INCL BRKT
A/C FRT AUTO/AUX CONT(CJ2), A/C FRT MAN/AUX CONTROL(CJ3)
Eng: LL8
8th VIN Digit: S

1 Per Vehicle
Isuzu Ascender

4.2L L6 Gas DOHC
1
 
GM Original Equipment
INCL BRKT
A/C FRT AUTO/AUX CONT(CJ2), A/C FRT MAN/AUX CONTROL(CJ3)
Eng: LL8
8th VIN Digit: S
Wheel Base 129.0 In.
 

Isuzu Ascender



4.2L L6 Gas DOHC GM Original Equipment
INCL BRKT
A/C FRT AUTO/AUX CONT(CJ2), A/C FRT MAN/AUX CONTROL(CJ3)
Eng: LL8
8th VIN Digit: S
Wheel Base 129.0 In.

1 Per Vehicle