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Old 13th December 2010, 08:18   #504
t_i_m
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ZT-T CDTi

Join Date: Oct 2007
Location: Cheshire
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Quote:
Originally Posted by BigRuss View Post
It's not an ideal thing to have two thermostats, it would be far better to remove the old one then fit the remote housing, however the old stat being weaker should open very quickly after the new stat opened.

I don't see any issues with thermal expansion from what I can see it should be unaffected.
I would be very wary removing the old stat completely I imagine it will also be acting a flow restrictor to create the correct pressure in the block which is why the thermostat is positioned where it is.

On mine coolant was returning to the header tank immediately (with the in-line stat in place).

I had 82-84deg on a 20 mile dual carriageway run this morning, it went upto 88deg up a hill when the stat clearly opened and dropped to 86deg (load was increasing at the time). After reaching 'full' temperature and everything fully warmed up I saw 87 deg a few times even at slower speeds.

Overall its an improvement for me but like Jules says its not as effective as replacing the OEM stat.
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