It's time to flush the coolant in my 2007 V8 Vantage, and I figured I'd do the thermostat at the same time after reading about various stories of the rubber coming apart and either sticking the thermostat open, or getting sucked into the system. I don't think any of it has been changed yet.

My distillation of this thread seems to indicate that Ford upgraded the design of this thermostat at some point to prevent the rubber from coming off. So:

1) Aston part is 6G43-32-10449.

2) Jaguar part AJ811788 is the same as the OEM Aston thermostat.

3) The upgraded part is sold as Ford 2W9Z-8575-AB or Mastercraft RT1163.

Can anyone corroborate this info? Has anyone else used the upgraded sucker?

 

Yes . I used to Ford /Motorcraft one . No problems .

 

I used a Ford 'stat from NAPA. Had to remove housing completely from engine to get enough leverage on it to get the tabs under the ears though. It did NOT want to go gently into that good night... Anyway, has worked flawlessly since.

 

Pretty simple job, hope photos help, good luck.

 

These are great, thanks!

 

I believe this is the Motorcraft O-Ring, under $13.

Motorcraft - Seal (P) (RTS1079) https://a.co/d/5xyTf79

It is not much cheaper than the genuine AM O-Ring, under $16

https://www.scuderiacarparts.com/part/191272/astonmartin/6g433210310/seal-thermostat.html