Heater - Poor Performance In Extreme Cold

91ford15

Article No.
91-7-6

04/05/91


HEATER - POOR PERFORMANCE DURING VERY LOW AMBIENT TEMPERATURES


FORD: 1986-91 TAURUS

LINCOLN-MERCURY: 1986-91 SABLE


ISSUE: Poor heater performance during very low ambient temperatures may be caused by the following items.

^ Improper adjustment of the blend door cable

^ Improper thermostat operation

^ Insufficient openings in the plenum assembly.

ACTION: If poor heater performance is experienced, use the following service procedure to improve heater performance.


1. Make sure the blend door cable is adjusted properly. Refer to the 1986-91 Taurus/Sable Shop Manual, Sections 36-12 or 36-13, for service details.

2. Make sure the thermostat is working properly, Refer to the 1986-91 Taurus/Sable Shop Manual, Section 21-12, for service details.

Figure 1:

3. On 1986-87 cars, confirm that additional openings were made in the plenum, Figure 1. If the openings were not added to the plenum, refer to TSB 87-7-5 and make the additional openings.


NOTE: THE 1986-87 TAURUS AND SABLE ARE THE ONLY CARS REQUIRING ADDED OPENINGS IN THE PLENUM. 1988-91 TAURUS/SABLE CARS COME EQUIPPED WITH THESE OPENINGS FROM THE FACTORY. THEY WERE INCORPORATED AS A DESIGN CHANGE TO THE PLENUM ASSEMBLY.

OTHER APPLICABLE ARTICLES: 87-7-7
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
910706A Verify That Blend Door 0.2 Hr.
Cable Is Adjusted Properly
910706B Verify Proper Thermostat 0.3 Hr.
Operation
910706C Make Additional Openings 0.3 Hr.
To Plenum
DEALER CODING
BASIC PART NO. CONDITION CODE
18C433 55
OASIS CODES: 208100