HEATER, Air Intake: Operation: Operation

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The air heater element is used to heat incoming air to the intake manifold. This is done to help engine starting and improve driveability with cool or cold outside temperatures.

Electrical supply for the air heater element is controlled by the Powertrain Control Module (PCM) through the air heater relay. Refer to RELAY, Intake Air Heater for more information.

A heavy-duty cable connects the air heater element to the air heater relay. This cable will supply 12 - volts to an individual heating element within the heater block assembly.

The following chart displays the pre-heat, or turn-on times (in seconds) of the wait-to-start lamp. If the intake manifold temperature is above 66.09 degrees Fahrenheit, the wait-to-start lamp will not illuminate. Consequently, the intake air heater element will not be activated.

WAIT-TO-START LAMP TURN-ON TIMES

PRE-HEAT TIME WITH INTAKE MANIFOLD TEMPERATURE AT: (IN DEGREES ° F)	PRE-HEAT TIME WITH BARO AT: (IN. HG.)
	19.99 IN. HG	23.00 IN. HG.	25.00 IN. HG.	26.99 IN. HG.	29.00 IN. HG.
-40.09° F	30.0 seconds	30.0 seconds	30.0 seconds	30.0 seconds	30.0 seconds
-20.00° F	30.0 seconds	30.0 seconds	30.0 seconds	30.0 seconds	30.0 seconds
0.00° F	30.0 seconds	30.0 seconds	30.0 seconds	30.0 seconds	30.0 seconds
0.09° F	15.0 seconds	15.0 seconds	15.0 seconds	15.0 seconds	15.0 seconds
15.00° F	15.0 seconds	15.0 seconds	15.0 seconds	15.0 seconds	15.0 seconds
15.09° F	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds
32.00° F	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds
50.00° F	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds
66.00° F	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds	10.0 seconds
66.09° F	00.0 seconds	00.0 seconds	00.0 seconds	00.0 seconds	00.0 seconds