so with a shot heater valve I've decided to finally replace teh major elements of my aging cooling system. However, I'm not sure which manufacturers I should go with on certain parts, or which parts I should pck up in certain instances:

1) Thermostat:
The car is a 1985 745t m46. Which thermostat below do I want? I think I want the 87 wahler, but I really have no idea.
Thermostat Calorstat87ø $15.93 $7.40
Thermostat Wahler 82ø Wahler $15.93 $8.49
Thermostat Calorstat92ø $16.76 $7.11
Thermostat 71øC/160øF Wahler $15.93 $8.57
Thermostat 92øC/197øF Wahler $16.76 $8.15
Thermostat Wahler 87ø Wahler $15.93 $8.45

2) Heater Valve:
The following have extreme price differences... I've seen Mission's name around, do they make solid parts? Who is 4 seasons? I'm assuming the expensive one is from Bosch or something, but I would think it would say so in teh parts list. Obviously I'd like to save $50 and go with the Missions part, but I don't want it to crap out on me.
Mission Trading Company $66.01 $13.16
4-Seasons $66.01 $15.03
Heater Valve $66.01 $54.35

I'm also picking up a Nissens copper 3 row and a new 150kpa cap for teh expansion tank.

Thanks in advance for the help.

-rt

From FCP Groton I received a Scantech heater control valve, less than $15US. Was pleased as I thought I was getting a Mission Trading Co. A company no one seems to know much about. The Scantech seems to be identical to the original it replaced from my 93 945T. Scantech I believe is Swedish made and of good quality.

Would have preferred an all metal construction but they seem to be unavailable.

Have used all stainless steel Vernet thermostats without any problem. In fact my mate pulls them from wrecks and uses them in preference to the non stainless steel Wahlers etc.

Take care,
John H from Downunder

Turbos use 87 C, NA engines use 92 C thermostats.

Don't know about "Mission Trading" (sounds Chinese), but Four Seasons is a well-known brand of quality AC components.

"Four Seasons is a well-known brand of quality AC components."

Except compressors: Known as "four seizens".
--
1992 940 wagon, 72k
as well as others.