All rights reserved. Printed in the United States of America. Page 4 a word that matches the picture (Listening Comprehension standard score = 84) and generate words within a category, describe scenes, and give directions (Oral Expression standard score = 83).
The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
A thermostat is used to block coolant flow to the radiator until it warms to the proper temperature. When the engine thermostat fails to close fully, the engine coolant temperature may fail to rise enough. Low engine temperature causes several problems and may cause the heater to blow cool air.