Changing Thermostat...

Phil Rose pjrose at
Mon May 15 20:05:28 EDT 2006

At 2:48 PM -0700 5/15/06, Derek Pulvino wrote:
>Has anybody had success with changing the thermostat when not also doing the
>t-belt?  I got chinsey last time and didn't change the thermostat at the
>last t-belt interval, now it appears that thermostat is not working right. 
>I've got a new multi-function sensor in, and the temp. gauge only gets up to
>standard operating temparture after I've been sitting in traffic...usually
>barely makes it way off the bottom of the meter.
>I remember in the past having to get in to the housing to tighten the bolts
>around the thermostat, and remember just tightening those bolts was a big
>p.i.a.  So any luck by anyone changing the thermostat?  Any special things
>you removed to help access  (timing belts, t-belt covers, and water pumps
>not included)?

I seem to recall doing mine when the PS pump was off for a rebuild. 
In fact I just found a 12/98 posting I wrote to Chris Miller, in 
which I said the following:

At 10:08 PM -0400 12/1/98, Phil and Judy Rose wrote:
>I've just replaced the thermostat, which is infinitely easier to 
>reach when the PS pump is removed. The thermostat was pretty easy to 
>do, once I acquired some 1/4" metric sockets. It turns out that the 
>lower of the two 10mm bolts holding the thermostat cover is *very* 
>hard to reach with standard wrenches. And there's just no room to 
>fit in  a 3/8" ratchet w/ 10mm socket. But a 1/4" ratchet handle 
>_will_ fit. The problem is that the radiator is too close--at least 
>on my car. Tolerances my be loose enough so that other cars could 
>give an extra 1/8 or 1/4", which would allow a 3/8" ratchet drive in 

So--depending on how important "infinitely easier" actually is-- you 
might leave all hydr. hoses connected-- just slacken the drive belt 
and pull the pump out and away as far as possible.



Phil Rose
Rochester, NY
mailto:pjrose at

More information about the 200q20v mailing list