op amp output

Hello, I'm trying to make a thermostat circuit that uses an op amplifyer
in voltage comparator mode. The circuit is here:
http://www.interq.or.jp/japan/se-inoue/e_ckt25.htm

The problem is, circuit doesn't work since when op outputs low it gives
1,35 V (it gives 11,93 V when high, powered from a car battery).. I
understand that non-ideal op amps suppose to output high and low with
slight offset.. but 1,35 V is just to much.. how can this be solved?

Thanks alot


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