PINPOINT TEST C: THE A/C DOES NOT OPERATE OR DOES NOT OPERATE CORRECTLY
Feel the heater core inlet hose.
Is the heater core inlet hose too hot to handle?
Yes
GO to B4.
No
GO to Section 303-03A.
B3 CHECK THE ENGINE COOLING SYSTEM INCLUDING RADIATOR CAP FOR LEAKS
Fill the engine cooling system to specified level.
Pressure check the engine cooling system. For additional information, refer to Section 303-03A. It is not
necessary to check the components separately at this time.
Does the engine cooling system, including the radiator cap, hold pressure?
Yes
GO to B4.
No
PRESSURE TEST the heater core.
B4 CHECK THE HEATER CORE OUTLET HOSE FOR HOT WATER
Feel the heater core outlet hose.
Is the heater core outlet hose cool or cold?
Yes
TEST the heater core for a plugged or partially plugged condition.
No
GO to Pinpoint Test D.
CONDITIONS DETAILS/RESULTS/ACTIONS
C1 CHECK THE PID ACCS WITH THE A/C OFF
Place the function selector switch in the OFF position.
PCM PID ACCS
Page 11 of 301999 F-150/250 Workshop Manual
8/16/2010http://www.fordtechservice.dealerconnection.com/pubs/con...
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