1998-2000 GMC Envoy Heater Core Torque Specs

4.3L V6 Vortec

Applies to 1998, 1999, and 2000 GMC Envoy

Labor Time:6 hours

🔧 Torque Values8 specifications

Component	lb-ft	Nm	Notes
Cover Screws	8	11	—
Drain Petcock	6	8	Hand tight
Fan Bolts	9	12	—
Hose Clamps	3	4	Do not overtighten
⚠️ Housing Bolts	10	14	—
Mounting Bolts	20	27	—
⚠️ Pump Bolts	21	28	Torque in sequence
⚠️ Thermostat Housing Bolts	12	16	—

⚠️ = Critical torque value | Always verify with vehicle-specific service manual

⚠️ Some critical specs are estimated. Please verify sequence.

1990-1997 4.6L V8 Modular

2007-2012 3.7L I5

2011-2016 6.7L V8 Power Stroke Diesel

2022-2024 GT-Line Dual Motor AWD

1992-1995 1.5L I4 D15

2016-2023 2.0L Turbo I4

The primary torque specification for heater core on a 1998-2000 GMC Envoy is 11 Nm (8 lb-ft).

There are 8 torque specifications for heater core on the 1998-2000 GMC Envoy 4.3L V6 Vortec, covering all related fasteners and components.