Heater System - Slow Warm Up/Insufficient Heat

89Ford22

A/C-HEATER SYSTEM-SLOW WARM-UP OR INSUFFICIENT HEAT

Article No.

89-15-5

FORD: 1989 THUNDERBIRD

LINCOLN-MERCURY: 1989 COUGAR


ISSUE: The A/C-Heater system may be slow to warm up after the vehicle is started or it won't provide enough heat after the car has been running for a reasonable length of time. This condition is usually caused by the temperature control cable being out of adjustment.

ACTION: If service is required, check the A/C-Heater system and adjust the temperature control cable by using the following service procedure.

1. Check the radiator coolant level. Add coolant (50% anti-freeze, 50% water) if required.

Figure 1:

2. Check and adjust the temperature control cable as follows:

a. Check for any interference that may prevent the control cable and self-adjusting clip from moving through its complete range of travel.

b. Move the temperature control lever to the "Full Cool" setting.

c. Hold the temperature blend door crank arm firmly in position.

d. Grasp the cable end and self-adjusting clip with pliers, as shown in Figure 1.

e. Pull the cable wire through the clip until there is a space of approximately 3/4 inch (18 mm) between the clip and the cable end.

f. Move the temperature control lever to the "Full Warm" setting to position the self-adjusting clip.

g. Move the temperature control lever from the "Full Cool" to the "Full Warm" setting to be sure that the temperature blend door is firmly seating at both ends of its travel range.

h. Make any necessary final adjustments.

Figure 2:

3. Check for gaps in the evaporator case seam when adjusting the temperature control cable.

a. Examine the area directly under the temperature blend door crank arm as shown in Figure 2.

b. Seal any gaps as necessary with caulking cord rope sealer (D6AZ-19560-A), or equivalent.

4. Check to see that the heater core cover is properly positioned over the two locating pins on the evaporator case. If it is not, perform the following steps.

a. Loosen the four heater core cover screws.

b. Position the cover as it should be placed.

c. Retighten the screws.


PART NUMBER PART NAME CLASS

D6AZ-19560-A Caulking Cord Rope Sealer AG

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage

OPERATION DESCRIPTION TIME
891505A Adjust Control Cable 0.7 Hr.

DEALER CODING
BASIC PART NO. CONDITION CODE
19988 07
OASIS CODES: 2600, 2620