Question about 1990 Oldsmobile Cutlass Supreme Conv

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Car runs fine , then dies. Turned on gauge underneath heater/ac controls and viewed a sudden voltage loss, only does this when hot. what would cause this ? mustang.61@live.ca

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  • Terry Prigotzke Aug 01, 2013

    to charles j smyth jr My car shuts down after 2 hours of driving at normal operating temp. Regards Terry Prigotzke

  • Terry Prigotzke Aug 01, 2013

    Joshua Davis Altenator good checked it first. Terry Prigotzke mustang.61@live.ca

  • Terry Prigotzke Aug 01, 2013

    Short in wiring/ blower motor To bratt802

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SOURCE: lights come on car dies then starts back up when turn key

bad altenater

Posted on Nov 11, 2008

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newyorker4li
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SOURCE: i changed the thermostat on my 01 olds alero but it still overheats. i have a small leak from the coolant expansion tank but not a big enough one to drain the whole tank. it seems like the tank overfl

try checking your water pump the fluid just my be sitting there n not circulating or is poorly flowing n also check your heater core it might be clogged might need replaced

Posted on Apr 22, 2013

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CAR DIED WHEN TURNED ON AC


It sounds like the over heating problem might be a blown head gasket dose the motor oil have water in it or water have oil in it .and the ac sounds like the clutch on the ac unit is bad i had the same car and it did the same thing and the belt on the ac did not brake the motor just dies

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Year make and model ? I doubt the heater ac control would affect the engine temp gauge.

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I turned on the ac and the light does not work, the vents are not blowing and the car is running hot. I have a saturn SL 1996


First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.

Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.

It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.

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Is the ignition system pointless electronic or does it have points? Are you getting any fire at all now to the cylinders? Does the tach in the vehicle show any RPM's during cranking? Do you have voltage at the positive side of the ignition coil? Does the coil meet the ohm ratings for that years vehicle ignition? Does the vehicle have oil in it so the oil pressure sensor allows the engine to run, this may not be an option on your particular vehicle? You can check most of this out with a volt/ohm meter. Check your voltages before starting the vehicle, during running and after it quits to see where the loss is. Just don't get near the center tap of the coil or you will get a rude awakening and/or serious injury. Good luck, RAC

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