2002 GMC SAFARI heater

6-20 Reinstalling the Engine Cover
1. Lift the engine cover into the front of the vehicle
and slide it all the way forward. Make sure the
rubber seal is over the latches.
2. Tighten the two bolts located on the engine cover
to reinstall the cover to the front of the dash.
3. Put the heater duct over the engine cover studs.
Push up on the duct gently until it snaps into place.
4. Reconnect the electrical connectors.
5. Reconnect the AM radio ground strap.
6. Reinstall the engine cover extension by gently
squeezing the sides and sliding it into place.
Make sure all of the fastener clips engage and the
extension fits properly in place. Reinstall and tighten
the two screws.
7. Reinstall the two nuts to secure the extension
in place.
Engine Air Cleaner/Filter
Refer to the Maintenance Schedule to determine when
to replace the engine air cleaner/filter and the crankcase
ventilation filter. See ªScheduled Maintenanceº in
the Index.
See ªEngine Compartment Overviewº in the Index for
more information on location.

6-29
Engine Coolant
The cooling system in your vehicle is filled with
DEX
-COOL engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, if you add only
DEX
-COOL extended life coolant.
The following explains your cooling system and how
to add coolant when it is low. If you have a problem
with engine overheating, see ªEngine Overheatingº
in the Index.
A 50/50 mixture of clean, drinkable water and
DEX
-COOL coolant will:

Give freezing protection down to
-34F (-37C).

Give boiling protection up to 265F (129C).

Protect against rust and corrosion.

Help keep the proper engine temperature.

Let the warning lights and gages work as
they should.
NOTICE:
When adding coolant, it is important that you
use only DEX
-COOL (silicate-free) coolant.
If coolant other than DEX-COOL is added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner
-- at
30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the
use of coolant other than DEX
-COOL is not
covered by your new vehicle warranty.

6-30 What to Use
Use a mixture of one-half clean, drinkable water and
one
-half DEX-COOL
coolant which won't damage
aluminum parts. If you use this coolant mixture,
you don't need to add anything else.
CAUTION:
Adding only plain water to your cooling system
can be dangerous. Plain water, or some other
liquid such as alcohol, can boil before the proper
coolant mixture will. Your vehicle's coolant
warning system is set for the proper coolant
mixture. With plain water or the wrong mixture,
your engine could get too hot but you wouldn't
get the overheat warning. Your engine could
catch fire and you or others could be burned.
Use a 50/50 mixture of clean, drinkable water
and DEX
-COOL
coolant.
NOTICE:
If you use an improper coolant mixture, your
engine could overheat and be badly damaged.
The repair cost wouldn't be covered by your
warranty. Too much water in the mixture can
freeze and crack the engine, radiator, heater core
and other parts.
If you have to add coolant more than four times a year,
have your dealer check your cooling system.
NOTICE:
If you use the proper coolant, you don't have to
add extra inhibitors or additives which claim to
improve the system. These can be harmful.

6-71
Relay Usage
A/C Relay
(Rear Heat
and A/C)Rear Heat and
Air Conditioning
Upfitter
-ACCY
RelayUpfitter Accessory
Starter
Enable RelayStarter
A/C Enable Relay Air Conditioning
Headlamps Relay Headlamps
Fuel Pump Relay Fuel Pump
Fuse/Circuit
BreakerUsage
UPFITTER
-BATT Upfitter Battery Power Stud,
Trailer Wiring Harness
UPFITTER
-ACCY Upfitter Accessory Relay
Spare Not used
Spare Not used
Spare Not used
ECM
-1B Fuel Pump Relay and Motor,
VCM, Oil Pressure Switch/SenderFuse/Circuit
BreakerUsage
HORN Horn Relay and Horn
A/C COMP A/C Enable Relay and
Compressor
RR HTR/AC Rear Heater and A/C
ATC Active Transfer Case
-L Van
FRT HVAC Front Heater and A/C
ENG
-I Oxygen Sensors, Camshaft
Position Sensor, Mass Air Flow
Sensor, Evaporative Emission
Canister Vent Solenoid
IGN
-E A/C Enable Relay Coil
ECM
-I Fuel Injectors 1-6, Crankshaft
Position Sensor, VCM,
Coil Driver Module (EST),
Ignition Coil
Blank Not Used
RH HDLMP Right Headlamp
LH Headlamp Left Headlamp
Blank Not Used
Blank Not Used

6-73
Capacities and Specifications
All capacities are approximate. When adding, be sure
to fill to the appropriate level or as recommended in
this manual. English and metric conversions are given.
See refrigerant charge label under the hood for charge
capacity information and requirements. Please refer to
ªRecommended Fluids and Lubricantsº in the Index
for more information.
Engine Specifications
Engine ªVORTECº 4300 V6 MFI*. . . . . . . . . . . . . .
RPO LU3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firing Order 1
-6-5-4-3-2 . . . . . . . . . . . . . . . . . . . . . .
Horsepower 190 at 4,400 rpm. . . . . . . . . . . . . . . . . . .
*Micro Fuel Injection
Wheel Nut Torque
Base or Optional Wheel 100 lb-ft (140 N´m) . . . . . . .
Tire Pressures See ªLoading Your. . . . . . . . . . . . . . . .
Vehicleº in the Index.
Cooling System Capacities
Quantity
without Rear Heater 13.5 quarts (12.8 L). . . . . . . . . .
Quantity
with Rear Heater 16.5 quarts (15.6 L). . . . . . . . . . . .
Engine Oil with Filter 4.5 quarts (4.3 L). . . . . . . . . .
Fuel Tank 27.0 U.S. gallons (101.8 L). . . . . . . . . . . .
Transmission Fluid
(Drain and Refill) 5.0 quarts (4.7 L). . . . . . . . . . . .
Differential Fluid
Front Axle 2.6 pints (1.2 L). . . . . . . . . . . . . . . . . . .
Rear Axle 3.5 pints (1.7 L). . . . . . . . . . . . . . . . . . .
All capacities are approximate. When adding, be sure
to fill to the appropriate level, as recommended in
this manual. Recheck the fluid level after filling.
See ªRecommended Fluids and Lubricantsº in the
Index for more information.