Dodge RAM TRUCK 1500 1995 Service Manual page 1680

B R
HEATING AND AIR CONDITIONING 24 -11
check the air temperature coming from the floor out­
lets, refer to Temperature Reference Chart.
TEMPERATURE REFERENCE CHART
Ambient Temperature
Minimum Heater System
Floor Outlet Temperature
Celsius
Fahrenheit Celsius
Fahrenheit
15.5°
60° 62.2°
144°
21.1 0 70° 63.8°
147°
26.6°
80°
65.5° 150°
32.2° 90°
67.2° 153°
9124-4
If the floor outlet air temperature is low, refer to
Group 7, Cooling System for coolant temperature
specifications. Both heater hoses should be HOT to
the touch. The coolant return hose should be slightly
cooler than the supply hose. If coolant return hose is
much cooler than the supply hose, locate and repair
engine coolant flow obstruction in heater system.
Possible locations or cause of obstructed cool­
ant flow:
• Pinched or kinked heater hoses.
• Improper heater hose routing.
• Plugged heater hoses or supply and return ports at
cooling system connections (refer to Group 7, Cooling
System).
• Plugged heater core.
If proper coolant flow through heater system is ver­
ified and outlet air temperature is still low, a me­
chanical problem may exist.
Possible location or cause of insufficient heat:
• Obstructed cowl air intake.
• Obstructed heater system outlets.
• Blend-air door not functioning properly.
TEMPERATURE CONTROL
If temperature cannot be adjusted with the TEMP
knob on the control panel, the following could require
service:
• The control cable (not connected or not routed
properly).
• Improper engine coolant temperature.