Day time driving lights go out when my heater quits working.
2000 pontiac gran prix. My heater fan switch only works on HIGH. If I turn the switch down from HIGH the heater fan quits and the day time driving lights go out also. (A/C button and Rear Defrost button also do not work when this happens). WHERE DO I START??? HELP!!!!
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Believe it or not, but it was a bad ignition switch. I the switch apart and found about 3 different and one in particular that were burned pretty bad. Must have been the circuit that controls the blower and DRL? Found the solution on another blog. I put a new switch on in about 1.5 hours. I does take a couple special tools, very small female torx sockets. Other than that pretty easy.
i do believe you have to take the passengers side dash apart behind the glove compartment. go to autozone and get a manual or go to the library and check the chiltons manual. this is not an easy job. how bad is the leak? if its not bad these heater cores are made of all aluminum. i would buy a bottle of that radiator additive and see if that takes care of the problem first. it only cost about 5 bucks a bottle and it may permanantly fix your problem.