T E C H N I C A L I N F O R M A T I O N
Contents
1. TECHNICAL INFORMATION Electronic Air Conditioning Digital Climate Control Option The Digital Climate Control option also known as Electronic Air Conditioning found on the 84 87 Buick Regal is prone to failure due to component failure and heat fatigue This optional dash control option C68 uses a touch screen technique to select various heat defrost blower and AC functions within the passenger compartment of the vehicle Essentially it works like the mechanical counterpart except it uses electrical solenoids and air diverters which are controlled by the control head digitally through a microprocessor based controller When the system fails you will generally see certain symptoms the most common ones being a stuck air diverter door or temperature door actuator or the Blower and A C Clutch Control Module When the module fails there are usually two symptoms associated with failure the blower fan runs on high at all times losing control of the blower speeds or the AC compressor clutch either stays on all the time or does not operate The troubleshooting procedure regarding this system is lengthy and beyond the scope of this article This data found in the factory service manual is available at www installationinstructions com FY climatecontol87 pdf in downloadable PDF format This article deals primarily with the Blower and A C Clutch Control Module located on the heater enclosure under the hood secured by two screws2. There are two connectors plugged into the module one 5 terminal and one 2 terminal connector These are situated in such a way as to retain moisture causing a failure due to corrosion Caspers has re designed this module Part Number 107146 with a different connection design to overcome this design flaw RIGHT Control Head front and rear views BELOW Blower and AC Clutch Control Module a Peltede n el Upon removal of this module you can clearly see the effects of corrosion and intense heat damage The module uses high power transistors as a means to control the compressor clutch and the blower motor and these transistors produce a great deal of heat in the process The heat generated reduces the life of the component causing component fatigue and electrical failure When using the service manual for troubleshooting be aware of the incorrect pin assignments shown in the original schematic of the Module The factory manual showed A and B of this wiring diagram incorrectly swapped The correct designation is shown below in red L j fri vi A deo VI BiT Aiu Toe JALE MUARO Wr T i ET un en PE On Tit rowra et bi jn 1 iy j prain A hi To C hi WOLTER Pt nisin LL Te WoL th Or jato Bz Vhs ee d cre er T TGH miras ADOT EET Pay f AL owen B TORRO ViN I i Vi WINA VI ViN Y i mores I LTU gE it Pitt Y Dm ao a a a a Fi Before installing the Caspers replacement module inspec
3. t the original connector for signs of corrosion and overheating Repair this connector before installing the new module as damaged terminals will not provide a proper connection Contact cleaner is not adequate to restore a corroded terminal replace the terminal when any signs of corrosion are evident The Caspers replacement module is supplied with a separate battery feeder that attaches directly to the battery to overcome the design flaw of the original module burned feeder terminal on the module Shown below are two variations of GM control heads These have been in use from 1983 thru 1988 on the B C G E and X body cars and there are dozens of different part numbers in use They are occasionally interchangeable however some functions such as DEFROST may not be functional on certain control heads Be sure to locate the same part number when replacing the control head Hi ELECTRONIC TOUCH CLIMATE CONTROL 1B 21 24 27 30 AUTO s COOLER WARI MER OFF HEATER ECON AUTO Bi LEVEL 1 DEF a eA E3505 E3474 G3620 B3504 ELECTRONIC TOUCH CLIMATE CONTROL 65 I 70 l 75 i a0 l OFF economy fio ALTE Hil BiLeveL QJ DEF a SVEN Gh
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