Hello Belinda Reid,
(sorry... I'm sure you are not in the mood right now)...
There are CADILLAC Clubs across this country
(lovers, admirers, professionals & amateurs)...
I recommend for future issues you seriously consider
looking into joining... The wealth of information is
really quite EXCELLENT... or buying your own set of
FACTORY WORKSHOP REPAIR MANUALS.
For these issues... (I doubt they are related)
Starting with a GREAT CIRCUIT DIAGRAM
would be the best approach...
I PREFER PROFESSIONAL GRADE FACTORY
repair manuals ... but FREE
circuit drawings & your 22
TECHNICAL Service Bulletins (TSBs
) can be found
on BBB Industries website
(registration is required... these are real documents)
BBB Industries Premium Alternators Starters Power Steering Products
In the 1989 Deville (an issue shared issue w/Eldorado) ...
I did find a TSB on "BLANK DISPLAY
" ... Ironically the
page was also blank (GM humor ..
The FUEL GAGE seems to be a popular part...
(typically means "unreliable:
great point to START").
On eBay (refurbished (1 year warranty)
OEM 1985 1993 CADILLAC DEVILLE FLEETWOOD FUEL DATA CONTROL DISPLAY 1YR...
(out of stock (I rest my case))
More Information for BLUE STREAK ELECTRONICS FDC1
Also see HVAC Controls, Motors & relays
(another OUT of STOCK: popular
More Information for BLUE STREAK ELECTRONICS PRG2
ENTIRE control panels are available on eBay(some good... some NOT-SO-MUCH (but you are protected (sorta)).
85 92 CADILLAC DEVILLE ELECTRONIC CLIMATE HEATER AC CONTROL SWITCH eBay
Dress warm... happy hunting
On the HVAC if the controls seem to be working... another
popular part are in the ACTUATOR DOOR sections of your parts catalogs...
Look through the eBay parts for ideas...
0results for cadillac 1989 deville hvac vac control
AND don't overlook the CONTROL RELAYS
that ABOUND in
your vehicle... Buy a few spares BEFORE
they become rare.
Hope this helps.
Carnac the Magnificent