[TR] TR4A overheating

[Randall]

> BTW, the normal temp range for TR4A is using a 165 deg 
> thermostat with a 4
> lb radiator cap.

There is a service note dated April 8, 1965 that describes an 82C (180F) wax pellet thermostat.  According to Piggott, 82C was
standard, but some cars were fitted with 88C (for cold climates).

Piggott also agrees with Moss that the radiator cap was changed to 7 psi during TR4 production, and all TR4A had 7 psi.

Apparently, they never updated the workshop manual with these changes.

Note that the change to 7 psi did not happen at the same time as the filler neck change, so there are 7 psi caps listed in both 3/4"
reach and 1" reach.  Obviously you want to be careful to get the cap that matches your neck.

Randall