Theory Of Operation; Thermostat; Electric Cooling Fan Operation; Relay Locations - Winnebago 1987-1989 LeSharo Service Manual

THEORY OF OPERATION
Thermostat
The thermostat has two operating conditions.
When the coolant is cold (1):
• the thermostat valve is closed and prevents the
flow of coolant from the engine to the radiator
• the thermostat bypass is open and allows coolant
to circulate within the engine.
When the coolant is hot (2):
• the thermostat valve is open and allows coolant to
flow from the engine to the radiator
• the thermostat bypass is closed
WARNING
Do not loosen the coolant bottle cap or remove the
cylinder block drainplugs with system hot and
pressurized because serious burns from coolant can
result.
RELAY SCHEMATIC
85 87a 87
+----~
86 30
I
. I
Common
Terminal
5-Pln Relay (Typical)
Normally
Open
Terminal
Relay
Coli
Terminals
Normally
Closed
Terminal
87
Electric Cooling Fan Operation
The electric fans are powered by a relay for each fan
and a thermo-switch mounted in the bottom right
(passenger) side ofthe radiator. When the coolant in
the radiator reaches the specified temperature, the
thermo-switch closes completing the circuit to the
relays, which in turn switches the 12-volt current to
each fan.
Relay Locations:
Black relay and diode box behind right headlight.
See Electrical and/or Air Conditioning Section for
specific wiring information.
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