Auto Parts and Repairs
Heating AC and Engine Cooling
Thermostats

Can a bad thermostat cause your battery to go dead and ac blow hot air And what other negative effects can a bad thermostat have on your vehicle?

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2009-06-17 00:04:17
2009-06-17 00:04:17

I've actually heard a bad thermostat can cause the evaporator core to malfunction.I've also heard of some a/c compressors will shut off if the engine temp gets to high which could be a thermostat issue.

No, the thermostat has no effect on the battery or on the A/C. A thermostat either works correctly or it will stick open or stick closed. Sticking open will cause the engine to never reach full operating temperature, and as such your heater will not work properly. A thermostat stuck closed will cause the engine to overheat.

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The battery cable that is grounded, is connected to the body of the vehicle. Sometimes it is the negative cable & sometimes it is the positive. You need to check which cable is connected to the body of the vehicle.

Depends on the vehicle, but normally it bolts to the engine. The negative is the ground cable.

Dead short in the battery. Battery can explode and damage can be done to the electronics in the vehicle.

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In a negative ground system, hook the vehicle ground (frame) to the negative of the first battery, positive of that battery to negative of second battery and the positive of the second battery back to vehicle positive. ( starter or starter solenoid) If you are hooking 2 12 volt batteries in series you will have 24 volts.

Something on the vehicle is on pulling power.

Take the # 1 battery and connect the positive cable to the vehicle. Then connect the negative cable on # 1 battery to the positive post on battery # 2. Finally connect the negative post on battery # 2 to ground on the vehicle. You will have 12 volts but only the amperage of #1 battery.

First off you must have the same type batteries. Connect the positive post of the first battery to the positive post of the second battery. Then connect the negative post of the first battery to the negative post of the second battery. Now connect the positive post of the first battery to the positive connection on the vehicle. Then connect the negative post of the first battery to the negative cable of the vehicle. Click the link for a diagram.

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the main negetive battery lead should run straight to the engine block

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No, that cable is connected to ground, so it cannot short out.

Ground it to the vehicle frame or engine.

Nothing unless you connect the negative cable to the positive post. When you do that you will destroy the battery and it may possible explode. You may also damage the electronics in the vehicle.

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Because there may be a spark when you connect a jumper cable negative clamp to the battery post which can cause an explosion. Batteries emit hydrogen gas which is very volitive. Always connect the negative clamp to the engine or another ground point on the vehicle.


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