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I have a 1990 Buick Centry, the temp. light always comes on ...
Sent to Car Experts April 26 03:01 AM

I have a 1990 Buick Centry, the temp. light always comes on shortly after starting engine, same with check engine light. But when I stop and open hood, the motor isn't that hot I can still put my hand on it. Can you tell me what it might be?

 

Optional Information:
1990 Buick centry 3300

Already Tried:
new sensor,new radiator,new thermastat

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Answer
April 26 5:37 AM (2 hours and 36 minutes and 32 seconds later)
         
REPLIEDCheck Mark

You could have a faulty temp gauge sender but you first need to determine what's putting the check engine light on. It may or may not be related.

Here is the procedure for retreiving those codes without a scan tool.

To extract a trouble from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

Ground terminals A and B with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A 12 consists of one flash, a short pause, then two flashes in rapid succession.

After 12 is displayed, any stored trouble s will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All s are displayed 3 times each then a 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.

Images available only to Customers.


ALDL Connector (Located Underdash)

The ALDL diagnostic connector is located in the passenger



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April 28 11:30 PM (2 days and 17 hours later)
         
Reply to Hammer Time's Post: I found what the problem was. But thanks anyway
Customer (name blocked for privacy)
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April 29 1:57 AM (2 hours and 26 minutes and 55 seconds later)
         
Relist: I want a different opinion.
Customer (name blocked for privacy)
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April 29 5:22 AM (3 hours and 24 minutes and 49 seconds later)
         
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Hammer Time -- L1 Master Technician -- 98% Positive Feedback on 2714 Car Accepts
ASE Mastertech with Adv level Engine performance cert.
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