wssix99

iTrader: (5)

Ah - You kept your old outlet. Life would be a whole lot better for everyone if GM kept with the 2 piece thermostats and housings... Not sure why they started making them a single unit.

laspisa

Yea, not sure why they have to change everything, not sure how this design would be more efficient. Maybe it seals a little better?

joecar

So, the old TS/housing does not fit in the newer pumps, but the new TS/housing fits in the older pumps, is this correct...?


old TS/housing = TS locks into housing wings
new TS/housing = two pieces

wssix99

iTrader: (5)

See this document on page #2. My read of it is that the thermostat designs are exclusive to the specific pump body. http://www.acdelcotechconnect.com/pdf/10JTI-064.pdf

My original factory housing was a two piece and the new ones have all been one pieces. My understanding is that all the new GM thermostats are the one piece design.

laspisa

You are correct, i couldn't get the new design (2 pieces) to fit in the old housing. Can't remember exactly why it didn't fit now, but it wouldn't have worked that I could tell. Just went and bought one for a 2004 GTO, the part number is listed on the first page of the thread, good luck!!