• I can think of two things that could possibly be wrong. Either your thermostat is not working properly,(ie.not closing) allowing the water to flow through the engine all the time and not reaching the proper temp or the valve to the heater coil is not opening properly. Usually, on the auto temp types the valve is vacuum controlled and may have a leak in the vacuum supply or it may be sticking. I am by no means and expert, but that is what I would check for first.
  • climate control lever won't swicth to heat.
  • Mode motor may need replaced

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