Question about 1999 Cadillac DeVille
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Posted on Jan 02, 2017
SOURCE: replaced both cooling fans all
when you first start the vehicle the fans whill cycle automatically. when the engine reaches temp the fans should kick on if they don't it is most like that you have either a weak relay or a loose wire very seldom would it be a severe ecm malfunction. please rate this solution
Posted on Aug 29, 2008
The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps
Posted on May 21, 2009
It's probably a bad connection to cooling fans, bad cooling fan, or relay in that circuit. Another spot to check is to clean backside of fuse block under hood, as they have been known to corrode up & cause similar problems.
Posted on Sep 17, 2009
SOURCE: 1999 cadillac deville overheats
every thing that is electric needs a power and a ground if running a new wire to the fans i would prefer you to use a inline fuse this will keep the wire from catching on fire. u could run the power wire to a fuse that is ignition switch 1,2,3 one of these will work so when u turn the key they kick on. also the ground could be a bolt on the bottom of vehicle. use a test light and see if that wire hanging down is a power wire. hope this helps
Posted on Apr 09, 2010
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The ability of the control modules to communicate through the serial data circuit
The identification of any stored diagnostic trouble codes (DTCs) and their status
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
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