What should the engine temperature of a 1990 and 1991 Honda Civic be. Both my and a friends daughters Civics just feel to take too long to warm up. I have placed a lab grade thermocouple on the engine, held be a magnet to a bolt, and both get to between 150 and 165 degrees F in 40F weather. My gut tells me this is a little too cold. What should I expect to pay for OEM Honda thermostats? Terry