Question about 1995 Cadillac Seville

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Car will not turn over and start

I tried to change my computer for the heater and it did not work so i hooked up the old one and now the car will not turn over or start and now i am getting all kinds of bad error codes and i tried to disconnect the battery and reconnect it and it did not do anything

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The vats security system in the car needs to be reprogrammed by a dealer

Posted on Jan 10, 2009

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Car wont start


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Electrical - won't start. Hooked up fan to heater, smoke came out from under the hood, car won't start. Lights work, any key related electrical functions won't work


Your fan or heater likely shorted out and burned up, causing your one of the main fuses to blow due to the spike in current. You will need to determine what burnt up and replace it before replacing the fuse, or you may create a fire hazard or cause further equipment damage. Also double check any changes to wiring to make sure that everything is hooked up properly.

Nov 01, 2011 | 1991 Chevrolet Cavalier

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I have a 1994 Pontiac Bonneville that needs the heater core replaced. Just wanted to get some tips with replacement or maybe some sites to visit. And wondering how difficult the task is. Thanks for your...


It will not be the easiest job you've ever done. you have to remove the panel from under the dash on the passenger side. (do yourself a favor, and drain the heater lines from the front first) then undo the hook up of the lines on the core( some cars are hooked up from under the hood, some inside the car, not sure about yours) get some towels(old ones to throw away) to catch the coolant, and save the inside of the car. unbolt the core, and remove( remember, its full of coolant), set the the new one in and hook the lines up first( this is the hard part), the bolt it back up( easier this way for me at least). replace the under dash panel, and start the car, let it warm up, and turn the heater on. After this, add coolant to replace what you lost. the job just takes time, hope this helps

Jan 10, 2011 | 1994 Pontiac Bonneville

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The heater core in a 97 cougar i just bought has been bypassed. Could the problem have possibly (hopefully) been something else besides the heater core?


Hi,
The answer is: Your first instinct is probably right. But, you're not going to know for sure until you hook it back up and check it out. Be careful, check for leaks inside and out of the car. You don't want to end up with more problems than you have now.
Hope this Helps,
RSMITH972278
P.S. PLEASE RATE ME !

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2003 s10 I had to change the ignition tumbler/key and the housing with the passlock chip. "the tumbler went out and froze in the housing. So now that I have a new key and chip the security light stays on...


  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to start the engine, then release the key to ON, vehicle will not start.
  3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
  4. Turn OFF the ignition, and wait 5 seconds.
  5. REPEAT STEPS 1 through 4 TWO MORE TIMES for a total of 3 cycles/30 minutes, the vehicle is now ready to relearn the Passlock™ Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
  6. Turn off the ignition and then attempt to start the engine.
  7. Clear any codes.
  8. If this don't work you will have to take it to a dealer and program it through there computer system.

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Did you try changing fuel pump relay?

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with battery going dead it cleared my computer,and would not identifiy my key code!,after leaveing the key in the on postion fo fifteen minutes,the computer restarted and it started,(re security light flashing)

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2004 Endeavor


Most likely the computer thinks the car has been stolen and will not let it start. You will need to take it to the dealer and the will have to reprogram the computer and unlock the security system. Hope this helps.

Aug 10, 2008 | 2004 Mitsubishi Endeavor

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