Electical problems. My a/c, cooling fan, and blinkers all quit working after I fiddled with my taillights.

My breaklight wouldnt work. Checked fuse boxes, took out a couple fuse…..all good. Took out the bulbs…..good. cleaned the bulb connectors with small wire brush and now they are working. Note….i didnt disconnect the battery. So now all brakelight are fine. Now for some reason the coolant fan, ac, and blinkers wont work!!!!

My car has 200000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. Check all of the grounds to the vehicle and make sure that they are all tight and clean. There could be a loose ground wire from the chassis to the frame causing the power loss to the air conditioning system, cooling fan, and the blinker lights. If you need further assistance with your electrical issues, then seek out a professional, such as one from Your Mechanic, to help you.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

The most common reasons a Jeep Grand Cherokee heater isn`t working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
If the coolant level is full, a typical cause of this kind of overheating is a bad thermostat (not opening and closing as it should) but other possibilities do have to be considered such as a partially blocked radiator, faulty radiator cooling fans, collapsed radiator hose, faulty radiator cap, and even other non- …
The blower motor is located under the dash on the passenger side of the vehicle. For easier access to the wiring push the seat back, and place your tools on the floor of the car .
If the heater isn`t blowing hot air at you when you turn the system on, the blower fan might have a problem. Either it`s not getting electrical power or, more likely, the motor itself has simply burned out. A blower motor in an older vehicle is likely to burn out over time, and may need replacement.
Look for it first around on the exterior of your machine, especially along the bottom edge near the ground. An AC`s reset button is typically red and visible, so it should be easy to spot. If you don`t see a reset button on the outside, it could be located inside the unit behind the service panel.
The most common reasons a Jeep Grand Cherokee is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat.
Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.
Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.
Reasons a Jeep Grand Cherokee AC Isn`t Working. The most common reasons a Jeep Grand Cherokee ac isn`t working are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor. You may not realize there`s a refrigerant leak until the air conditioner stops blowing cold.
If the fan doesn`t work, before pointing the finger at the blower motor, check fuses for the motor to make sure they`re still good. Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Electical problems. My a/c, cooling fan, and blinkers all quit working after I fiddled with my taillights.
ANSWER : Hi there. Check all of the grounds to the vehicle and make sure that they are all tight and clean. There could be a loose ground wire from the chassis to the frame causing the power loss to the air conditioning system, cooling fan, and the blinker lights. If you need further assistance with your electrical issues, then seek out a professional, such as one from Your Mechanic, to help you.

Engine cooling fan works fully when it’s cold
ANSWER : Hello. The cooling fan is activated when the temperature of the car reaches slightly above normal operating temperature. If the engine stays cool long enough, the cooling fans will not come on. If the engine gets warm but doesn’t overheat the cooling fan may stay on after the car has been shut off in order to cool down the engine. It is also possible that the coolant is low. This could cause the issue that you are describing with the engine cooling fan. It may be a good idea to have a certified technician, like one from YourMechanic, come out to top off the coolant in your vehicle.

I had dual cooling fans, the replacement part was a single larger cooling fan. Now I get aengine light about my cooling system. Ho
ANSWER : Hello,
You should check with the person you bought the fan from. I show a listing of a single or a dual fan system. You should replace the fan with the same as what was removed. You should not use the single fan when you were equipped with a dual fan system. The wiring and programming is different depending on how it was made.

My AC does not always work. If I fiddle with the blower knob I can ususally get it to work on the lowest setting.
ANSWER : Hi There,
It sounds like you may have a faulty blower motor resistor. The highest speed setting may still work because in most cars in the highest fan speed settings the current bypasses the blower motor resistor. In some cars, if the resistor is failed, the fan may stop working completely. Another reason a blower motor resistor may fail is when the blower motor has a mechanical problem or when a foreign object jams the blower motor fan blade and prevents it from spinning freely. This leads to increased current through the resistor and causes it to overheat and fail. I would suggest having an expert from YourMechanic come to your location to diagnose your system to determine what may be causing the fan not to work properly.

When replacing my fan clutch should I change my cooling fan to a flex-a-light and get a new flex-a-light clutch?
ANSWER : Hi there. It is best to always put on the OEM parts that are required for the vehicle. However, you can get a flex-a-light clutch fan for your vehicle as long as it will bolt up to your water pump pulley and clear the radiator and shroud. I recommend having a clutch design fan for your vehicle and not a fan that spins with the engine all the time. Those fans will cause the engine to overheat on highways and in town especially in hot weather. If you need further assistance with your cooling fan, then seek out a professional, such as one from Your Mechanic, to help you.

Front blinker issues. Blinkers work but flashing fast. Front blinkers are on but don’t flash when headlights are on.
ANSWER : Hi, thanks for writing in. It seems that the new bulbs that were put in most likely were not the correct bulbs. If the bulb has higher resistance than it should or improper grounding can cause the light to flash too fast. I recommend having the bulbs checked and the ground checked.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

The HVAC is not cooling the air in the car. Fan works, but no cooling. Can this be fixed by YourMechanic?
ANSWER : This can happen for a number of reasons such as being low on refrigerant, a faulty AC thermostat switch or a failing AC compressor. We do currently offer services for repairs/inspections of air conditioning systems.

Front A/C fan not blowing, but front seat cooling and rear A/C fans are working.
ANSWER : What you are describing sounds like a failure of the blower motor that circulates air in the HVAC system, however, there are certain faults that could occur in the electric circuit that powers the blower motor. If power is reaching the blower motor when the blower switch is in the on position and the blower motor is not functioning as intended then the blower motor is condemned and replaced. On the other hand, if there is no power, then the blower switch and the plug connection on the back of the switch, as well as the rest of the circuit should be inspected. If the circuit includes a blower motor resistor block, of course the resistor block has to be checked for continuity (i.e., specified resistance in ohms) at each position. If equipped with a relay in the circuit, that is easy to test and if the relay works consistently as commanded, you can assume there is no fault there. If you want these diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request a non functioning blower motor diagnostic/replacement and the responding mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic.