Question about 1999 GMC Sierra
GM's are known for possessing faulty antitheft systems. When these systems being to fail, the antitheft misinterprets the failure as an attempt to steal the vehicle. The system then shuts off the injectors. The system resets after 10 minutes exactly. As the fault gets worse, this will happen more often. Next time this happens, note any lights that illuminate on the dash area. If you see one that says SECURITY or ANTITHEFT, this is most likely the problem. This link will help you.
Posted on Feb 16, 2012
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Posted on Jan 02, 2017
Check the fuel cap!! If the vacuum relief is not working it can impede the fuel flow and cause the engine to shut down or not restart after a stop. Waiting usually gives things a chance to stabalize and the engine will restsrt. When this happens again try loosening the cap and see if the engine will restart.....If it restarts immediately, REPLACE the fuel cap..Do Not leave it loose because this will cause other problems. If it is not the fuel cap the problem may be the filter, the fuel pump, or aome other fuel system malfunction.
Posted on Jan 24, 2010
Testimonial: "Great will try it "
SOURCE: 93 gmc sierra heater not working
THERMOSTAT REPLACE IF NOT SEE IF HOSES ARE CLOGGED SHOT OF AIR COULD HELP OR DISSCONNECT BATTERY CABLE 10-15 MIN CONNECT BACK TRY HEATER
Posted on Jan 04, 2009
It sounds like you either have an condensor fan problem or low freon. The condensor fan is near the radiator. In some cases the radiator fan doubles as the condensor fan. So look there too.
Posted on May 09, 2009
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