Bosch 0392020034 Heater Water Pump

Bosch Engine Auxiliary Water Pump

Bosch Engine Auxiliary Water Pump 0392020034 is a heater water pump built to match original equipment specifications for dependable coolant circulation. It is 100% new and 100% tested, with torque testing and vacuum leak testing used to verify impeller-to-shaft integrity and sealing performance.

Compatible With 2000-2001 Cadillac Catera, 2004-2006 Chevrolet Silverado 1500, 2007 Chevrolet Silverado 1500 Classic, 2005-2006 GMC Sierra 1500, and 2007 GMC Sierra 1500 Classic. This Bosch auxiliary water pump is a direct-fit service part for vehicles using an engine auxiliary water pump in the cooling system.

Key Features

• Bosch Engine Auxiliary Water Pump, part number 0392020034
• Heater water pump application for auxiliary coolant circulation
• Built to original equipment specifications
• 100% tested for proper functionality
• Torque tested to verify impeller and shaft mating
• Vacuum leak tested to check housing, seals, tube binding, and plug leakage
• Uses OE mating parts and accessories to verify fitment where re-used isolator grommets and brackets apply

Detailed Description

Bosch 0392020034 is an engine auxiliary water pump designed for cooling-system service where a heater water pump is required. The pump is manufactured as a new replacement part and tested for torque integrity and vacuum sealing before release. Bosch also validates fitment with OE mating parts and accessories, which is important when the original isolator grommet and bracket are reused during replacement. This part cross-references 10438993 for the same application.

Vehicle coverage includes Cadillac Catera, Chevrolet Silverado 1500, Chevrolet Silverado 1500 Classic, GMC Sierra 1500, and GMC Sierra 1500 Classic. If you are replacing a Bosch Engine Auxiliary Water Pump 0392020034 on one of these applications, confirm the original pump style and mounting points before installation.

Common Uses

• Restoring coolant flow through the auxiliary heater circuit
• Replacing a leaking or worn engine auxiliary water pump
• Addressing poor heater performance caused by reduced coolant circulation
• Correcting noise or vibration from a failing pump assembly
• Resolving sealing issues at the pump housing or related connections

Installation Notes

Retain the original isolator grommet and bracket if they are designed to be reused on the vehicle. Inspect the mounting area, coolant hoses, and electrical connections before installing the new pump. After installation, refill and bleed the cooling system according to the vehicle service procedure to remove trapped air and verify proper operation.

Quality Assurance

Bosch tests each water pump for torque integrity and vacuum sealing to confirm proper impeller-shaft mating and leak resistance. The Bosch Engine Auxiliary Water Pump 0392020034 is produced to OE specifications for fit and function on the listed applications.