Basically if your thermostat is actually working it's impossible for it to run 20 degrees below the rating of the thermostat. It could be neg 20 outside and it should still run within 5 degrees of the thermostat rating.
At the cap is a bad place to check temp ... it's on the "cold" side of the radiator. If you have a infrared thermometer ... I'd try to shoot the driver side radiator tank to get a feel for average temp of water leaving the engine.
|