blower motor working sometimes
Thread Starter
Pole Position
Joined: Dec 2017
Posts: 238
Likes: 20
From: FL
blower motor working sometimes
Today was a hot day. We had the a/c in the 98 ls400 running for about 4 hours straight. Toward the end, after starting the car up from a stop, the a/c fan didn't kick in as expected.
The fan eventually kicked in after 1 or 2 minutes and it worked fine.
Later, the fan stopped working again. We heard some clicking noises.
Where should I start looking? I'm going to check the fuses tomorrow when it's not as dark. What about the relays? Would it even be a fuse or relay, since it seems to at least work sometimes? That means it's getting power, right, so it shouldn't be a fuse or relay?
How hard is replacing the blower motor myself? I already have the glovebox out from messing with the ECU a while ago. Any sort of guide?
Thanks in advance. Love this place. Have learned how to replace vvti valves, brake pads, ecu, hood struts, etc. here.
The fan eventually kicked in after 1 or 2 minutes and it worked fine.
Later, the fan stopped working again. We heard some clicking noises.
Where should I start looking? I'm going to check the fuses tomorrow when it's not as dark. What about the relays? Would it even be a fuse or relay, since it seems to at least work sometimes? That means it's getting power, right, so it shouldn't be a fuse or relay?
How hard is replacing the blower motor myself? I already have the glovebox out from messing with the ECU a while ago. Any sort of guide?
Thanks in advance. Love this place. Have learned how to replace vvti valves, brake pads, ecu, hood struts, etc. here.
CL Community Team
Joined: Aug 2011
Posts: 4,182
Likes: 1,010
From: Japan
I also need to inform you that the controller has a function to limit the excess current. This works when the motor's load is too much or the motor's winding is short-circuited.
CL Community Team
Joined: Aug 2011
Posts: 4,182
Likes: 1,010
From: Japan
The resistor is not the same with the controller but those two's functions are similar. The resistor reduces the current but at the same time it generates heat in accordance with the Ohm's law. On the other hand, a 98's controller almost don't because of the PWM. Semiconductors inside of the controller controls the current just turning ON and OFF the current very quickly. The ON/OFF ratio is given by the HVAC.
Thread Starter
Pole Position
Joined: Dec 2017
Posts: 238
Likes: 20
From: FL
If you could post it that would be great. I just need to know where everything is and where the bolts are.
Anyway, I checked the 60A heater fuse in the engine bay today. It looked blown--there was a lot of brown plastic. I replaced it. The fan started working again.
However, I noticed a clicking coming from the AC. When I tried to cycle the A/C fan on and off, the fan refused to come back on.
I checked the relay again and it doesn't appear to be burnt.
I'm thinking maybe something in the motor is causing an obstruction and causing it to draw too much current and thereby blowing the A/C relay?
No matter what, I want to get the relay and resistor removed to check them out.
Your diagram, even in japanese, would be invaluable.
Anyway, I checked the 60A heater fuse in the engine bay today. It looked blown--there was a lot of brown plastic. I replaced it. The fan started working again.
However, I noticed a clicking coming from the AC. When I tried to cycle the A/C fan on and off, the fan refused to come back on.
I checked the relay again and it doesn't appear to be burnt.
I'm thinking maybe something in the motor is causing an obstruction and causing it to draw too much current and thereby blowing the A/C relay?
No matter what, I want to get the relay and resistor removed to check them out.
Your diagram, even in japanese, would be invaluable.
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CL Community Team
Joined: Aug 2011
Posts: 4,182
Likes: 1,010
From: Japan
If you could post it that would be great. I just need to know where everything is and where the bolts are.
Anyway, I checked the 60A heater fuse in the engine bay today. It looked blown--there was a lot of brown plastic. I replaced it. The fan started working again.
However, I noticed a clicking coming from the AC. When I tried to cycle the A/C fan on and off, the fan refused to come back on.
I checked the relay again and it doesn't appear to be burnt.
I'm thinking maybe something in the motor is causing an obstruction and causing it to draw too much current and thereby blowing the A/C relay?
No matter what, I want to get the relay and resistor removed to check them out.
Your diagram, even in japanese, would be invaluable.
Anyway, I checked the 60A heater fuse in the engine bay today. It looked blown--there was a lot of brown plastic. I replaced it. The fan started working again.
However, I noticed a clicking coming from the AC. When I tried to cycle the A/C fan on and off, the fan refused to come back on.
I checked the relay again and it doesn't appear to be burnt.
I'm thinking maybe something in the motor is causing an obstruction and causing it to draw too much current and thereby blowing the A/C relay?
No matter what, I want to get the relay and resistor removed to check them out.
Your diagram, even in japanese, would be invaluable.
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