Photos of 07/08 RMK Cooling System - SnoWest Snowmobile Forum
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Polaris: IQ 2005-Current, all models in the IQ and IQ Raw chassis

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Old 02-28-2008, 02:53 PM
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Default Photos of 07/08 RMK Cooling System

Can some of you guys do me a huge favor and post some under hood pics of cooling system plumbing on a 600, 700 or 800 155? I'm trying to replumb my '06 Switcher to be more efficient with the rad removed and can't see everything that I need to from the microfiche. Thanks a ton!
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Old 02-28-2008, 03:31 PM
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If you run the thermostat from the 2008 163" 800 you can plug off the bypass loop which runs to the radiator. This thermostat has a built in bypass.

But I think that was hashed over before?

What do you need to see to do this?

The problem with doing this on your swicher is that the front tunnel cooler is different and provides a path for the coolant to the running board coolers. The 07's and 08's run the front cooler as the bypass, but both hoses go in behind the pull start housing (the 06 goes IN behind the pullstart housing and OUT under the secondary clutch... to the PTO side running board cooler)

The challenge to running the 07/08 layout on your 2006 switch would be to connect the outlet of the thermo to the PTO side running board cooler and hooking up the PTO side outlet of the 2006 front-tunnel cooler to the bypass on the bottom side of the head.

A lot of work IMO compared to using the 163” model thermostat and plugging the bottle and head connection.

Leave the rest of the system stock and just plug off the bypass while using the new thermostat.

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Originally Posted by mountainhorse View Post
Well, I just got the word back from a contact at Polaris Factory...



Looks like the different thermostat is the best bet to do the radiator/cooler delete on the 600's and the 700's in 2006 thru 2008 small blocks.

Plug off the bypass line on the head under the thermostat housing and install the 2008 163" thermostat # 7052452, for the coolest running of these sleds without damage to the pump or seals. This will also eliminate quite a bit of heavy plumbing with coolant in it and clean up the underhood appearance a bit. Probably leave the "inspection" hatch off of the radiator accesss to allow any of the air that might make it thru into the engine bay where it might do some good.

As a note to those who dont speak "bypass"... This is the line that lets enough coolant flow thru the motor to keep the pump and other seals from blowing out and allow a bit of circulation inside of the motor once the thermostat closes.


2007 Dragon cooling: note the side by side inlet/out for the front-tunnel cooler.


2006 Switch cooling system... note the front-tunnel cooler in/out locations
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Last edited by mountainhorse; 02-28-2008 at 03:46 PM.
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Old 02-29-2008, 11:22 AM
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Old 02-29-2008, 12:47 PM
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Old 02-29-2008, 03:27 PM
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