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I may have missed it on a previous thread but can someone tell me why the Caliber has or requires two separate thermostats?
Subliminally sucking-in rep points (Twilight Zone sound clip here)The engine cooling thermostat is a wax pellet driven, reverse poppet choke type. The thermostat is designed to
provide the fastest warm up possible by preventing leakage through it and to guarantee a minimum engine oper-
ating temperature of 88 to 93°C (192 to 199°F).
The primary thermostat starts to open at 77° C (171° F) and is fully open at 89° C (193° F).
The secondary thermostat starts to open at 95° C (203°F) and is fully open at 108° C (226° F).
No. They are completely independent.If one fails do they both fail?
Do they fail in the open position?
In pictures:The primary thermostat is located on the front of the water plenum in the thermostat housing/coolant inlet.
The thermostat has an air bleed vent located on its flange. The air bleed vent (1) and the locator dimple on thermostat seal provide for proper positioning of thermostat in inlet housing.
The secondary thermostat is located in the cylinder head under the water plenum.
The thermostat is operated by a wax filled chamber (pellet) which is sealed. When coolant reaches a predetermined temperature, the wax expands enough to overcome the closing spring and water pump pressure, which forces the thermostat to open. Coolant leakage into the wax pellet will cause a thermostat to fail in the open position. Do not attempt to free-up a stuck open thermostat.
If the thermostat is stuck open or allows coolant leakage through it, the engine will not operate at the proper temperature for obtaining engine fuel efficiency, performance and emissions levels. If this condition occurs, a diagnostic trouble code will be set and a MIL light will be turned on. Refer to the Powertrain Diagnostic Procedures manual for further information and diagnostics provided.
Thermostat diagnostics is included in powertrain control module’s (PCM) programing for on-board diagnosis. The malfunction indicator light (MIL) will illuminate and a diagnostic trouble code (DTC) will be set when an “open too soon” condition occurs. Do not change a thermostat for lack of heater performance or temperature gauge position, unless a DTC is present. For other probable causes, (Refer to 7 - COOLING/ENGINE - DIAGNOSIS AND TESTING). Thermostat failing shut is the normal long term mode of failure, and normally, only on high mileage vehicles. The temperature gauge will indicate this (Refer to 7 - COOLING/ENGINE - DIAGNOSIS AND TESTING).
Shhhh!He has the service manual,that's where!!
Well then! it's a good thing you are here. :worshippy:Shhhh!
Actually, the technical info was in the dealer service manual but the exact reason why there are two, I had to google it up.
As a software developer, I spend half my time digging up information so I do have a knack for finding stuff.
Yes it is. He can take over my job some day.:b1:Well then! it's a good thing you are here. :worshippy:![]()
That's some tough shoes to fill, This place just wouldn't be the same without you.Yes it is. He can take over my job some day.:b1: