I recently replaced the battery in my 1998 Blazer and the next day, I don't have any heat. I was told to remove the RDO fuse and put back in..I did that. Hot air blowed out for a few seconds, but then went cold again. What do I need to reset?
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Re: No heat after replacing battery
Replacing the battery has no effect on the heating system. Do U have a temp gauge to know if the engine is getting up to temp? and then the heater should put out heat. If it doesn't then U should look at replacing the thermostat
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you have a pcm controlled voltage regulator... in other your voltage regulator is built into the pcm... you can either replace the pcm or have the voltage regulator reinstalled on the alternator... the latter is cheaper most of the time... its not as simple as unbolting it from the pcm and its not something a home user can try to do... better to take it to the professionals for this. try a good alternator and starter rebuilder in your area... then and only then can you start testing to see why the battery light comes on whenever
its possible that the coils of the anternator are worn out. then the batterie dont charge.take voltmeter and see if the engine, is running ,if you read some 14.50 volts on the batterie is good. if you read 12 or 13 volts is bad the anternator
The thermostat is under the fitting with the upper radiator hose on. Remove the 2 bolts replace the thermostat, add coolant. Allow the engine to heat up with the radiator cap installed on the lock position not fully tightened. The air in the system will purge out into the reservoir. Fill the reservoir to the hot line when fully heated and no air is coming out anymore.
Need a new battery first, or charge the battery...if the battery is over 3 years old, I would just replace it, also may need a higher output alternator with more amps, to run the electronic fuel injection, fuel pump, and ignition etc...
the problem is the blend door actuator. Its is located behind hte glove box. (as far up and to the left as you get get with your hand). The gear inside the motor will crack if it is overdriven. As far as the re calibration, pull the rdo fuse(s). wait about 30 sec. replace fuse(s) turn car to run wait for 40 sec or so. you should be able to get a flashlight and watch the motor turn back and forth. turn key off. you should have heat. if not, pull the motor out. very easy just two screws. open the motor can check large gear for cracks