Cadillac Catera and Cimarron Forum Discussion, Need help Quick * changing thermostat in Past Cadillac Vehicle Discussion; so I decided to change my thermostat along with the heater control valve. didn't realize what a pain in the ...
PS: He mention pictures but they must have been deleted by the photo host server. sorry.
PPS: Found this a few replies down that thread. It might relate to the coolant transfer pipe.
Originally Posted by Marks DTM Calib
Pop the plenum off and remove the inlet system so you can see the valley. At the the rear of the valley you will see a large stainless steel pipe that travels around the 1-3-5 cylidner head to the rear where it attaches with two torx headed bolts (T12 I think), access to them is easier if you remove the heater bypass valve and associated pipes (two faston connectors to the bulk head, one clamp to the coolant bridge and one to the stainless coolant pipe plus a single vaccum connection).
There is an additional fixing screw on the 1-3-5 head into the lifting bracket and then two coolant pipes to remove, one to the header tank and the main return pipe from the rad. It should now move enough to get to the O-ring and allow it to be replaced. Do clean the block surface with some fine carboundrum paper (emery) before re-fitting.
Whilst its stripped inspect the valley for signs of leaks paying attention to the stat to block seal, oil cooler plate and coolant bridge seals.
I'm pretty much at the last part of dissassembly. as long as I can remove the crossover pipe from the thermostat housing, it's all reassembling from there. I'm just stuck on this part.
the crossover pipe fits into the thermostat housing and has 2 gaskets. the assebly is held in with friction, so there is no screwing.
so far my brainstorming has got me a couple of things to try.
- pipe wrench and hammer to loosen it .
- pipe wrench to twist it
- last resort. dremel to cut the crap out of the thermostat. (but don't really want to try this with the intakes being only blocked with tissue paper and with an exposed gas line, could be very bad.
still at work so don't know if any of these will work.
so I was hoping if anyone else had a trick or advise.
just in case anyone wants to do it in the future. here are a couple tips
do not unscrew the thermostat until you detatch the crossover pipe.
and the stupid screw the attaches the crossover pipe to the engine is a bia*** to put back in. you shoul mark or at least make a mental note on how things line up. since you don't have much room and can't really see it, linning up 3 things that the screw hold to the engine is very difficult.
and yippie.. no leaks... (not yet.. knock on wood.)