Water Temperature Sensor Fuse

[306V70]

I get some good help here so maybe this will help someone one day.

When the coolent temperature sensor goes bad or just something like the connector is bad, the cooling fan runs even after the car engine is turned off. This drains the battery significantly as the motor in that fan draws a lot of current (the fuse is 60 amps).
The fan can run for up to 3 minutes so it readly kills the battery after a few times. I found out the hard way and had to purchase a new battery over 220 dollars (USD).
The fan still runs of course, but now after i shut the engine down i pull the fuse to the cooling fan. That stops the fan from running. I put it back in when i have to go somewhere and pull it out again once i get there.
I will be fixing this soon though as that's the best way to handle this, but if you cant fix it right away at least you can pull the fuse to prevent the battery from draining.

Had the same Issue when i pulled the Temp sensor plug during engine operation. Fan kicked in and did never stop again, even with reconnected temp sensor... Regardless of Ignition Key position. Interesting was, that the temp gage reads nothing even with engine running and hot. I could fix the problem by disconnecting the Battery for five minutes. Everything back to normal. Maybe it it helps somone out there.

[306V70]

Had the same Issue when i pulled the Temp sensor plug during engine operation. Fan kicked in and did never stop again, even with reconnected temp sensor... Regardless of Ignition Key position. Interesting was, that the temp gage reads nothing even with engine running and hot. I could fix the problem by disconnecting the Battery for five minutes. Everything back to normal. Maybe it it helps somone out there.

[MrAl]

I get some good help here so maybe this will help someone one day.

When the coolent temperature sensor goes bad or just something like the connector is bad, the cooling fan runs even after the car engine is turned off. This drains the battery significantly as the motor in that fan draws a lot of current (the fuse is 60 amps).
The fan can run for up to 3 minutes so it readly kills the battery after a few times. I found out the hard way and had to purchase a new battery over 220 dollars (USD).
The fan still runs of course, but now after i shut the engine down i pull the fuse to the cooling fan. That stops the fan from running. I put it back in when i have to go somewhere and pull it out again once i get there.
I will be fixing this soon though as that's the best way to handle this, but if you cant fix it right away at least you can pull the fuse to prevent the battery from draining.

Had the same Issue when i pulled the Temp sensor plug during engine operation. Fan kicked in and did never stop again, even with reconnected temp sensor... Regardless of Ignition Key position. Interesting was, that the temp gage reads nothing even with engine running and hot. I could fix the problem by disconnecting the Battery for five minutes. Everything back to normal. Maybe it it helps somone out there.

Hi,

With my car if I disconnected the battery it was hell all over again because in NJ you have to have the monitors ready when you got to inspection, and with that car it would take months before they would become ready again. You could drive 100 miles and it would not help. So disconnecting the battery was not really a good option for me, i had to have the sensor replaced. Cost about $350 USD or something like that.