Section 13 — Cooling
To provide satisfactory engine cooling, the following conditions must be met:
1. Do not locate any large objects in front of the radiator core or grille such as batteries, spare tires, lights/sirens, etc. They restrict
air flow into the radiator core and influence fan blade stress.
2. Grille opening, size configuration and the external baffles provided should not be altered in any manner. Any reduction in cooling
ability may adversely affect engine/transmission performance.
3. Fan clutches not conforming to the original equipment specifications may not operate correctly and may stay “on” continuously,
never come on, or cycle on and off excessively. This will result in a reduction of fuel economy, engine overheat at times, and
annoying cycling respectively.
4. Continuous coolant flow is necessary from heater connection on engine-to-heater connection on radiator to control transmission
oil temperatures during closed thermostat (warm-up) operation. Do not alter this flow as it may result in premature engine or
transmission failure.
5. If a heater unit is not installed in the vehicle or a heater shut-off-valve is required, a line connecting the heater connection on the
engine to the heater connection on the radiator must be installed. When a shut-off valve is required in heating system, it must be
teed into the system in such a manner as to maintain continuous flow between engine heater connection-radiator heater
connection at all times.
6. Use GM 6277M Long Life Coolant only.
Do not install any internal flow restrictors.
• Heater hose: 3-way or 4-way valves must be used to provide constant water flow through the intake manifold pad area.
• If in-line shut-off valve is used in combination with 3-way valves, shut-off valve must not be closed until 3-way valve at engine is
in the proper position.
Valve Sources
3
Red-White Valve Corp., Carson, CA (213) 549-1010
Ranco Controls Div., Delaware, OH (614) 876-8022
4 Ranco Controls Div., Delaware, OH (614) 876-8022
Be sure to add coolant to system after adding capacity to system (heaters).
S/T SMALL UTILITY – SUV
(
C
HEVY BLAZER & GMC JIMMY
)
S/T Small Utility – SUV 2004
13
PAGE
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