I believe my '91 Accord needs a new thermostat. Lately, the engine is slow to war is slow to warm up to normal operating temp. I suspect the thermostat just stays open all the time.

I've looked at thermostats on Advance Auto Parts website and on http://www.innerauto.com/ and, in both cases, I found thermostats rated at 180 degrees, 170 degrees, and 195 degrees. How the heck do I determine the correct one to get?

Edit: perhaps I should mention my Accord has a 5-speed manual transmission.

IIRC, the OEM thermostat was 172 F. A 170 or 180 would be fine. Your call, whether you'd like normal operating temp to be just slightly higher or lower than original. The 195 is probably not a good choice.

Thanks. I will avoid a 195 degrees thermostat.