Question about 2002 Oldsmobile Intrigue

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Radiator cooling fans run when car is turned off killing battery

Mechanic has traced all the wires for electrical short. none found. had to replace master computer. no help. when car is turned off or turned on fans run all the time. if ignition switch is in on mode(so radio can play but engine not on, fans do not run).problem does not appear to be in fans or in temperture switch that controls fans switching on or off.

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The master computer controls one or more relays which control the fans. Usually the fans will come on sequentially as the engine temperature rises, first one fan, then both...and this is accomplished by up to three relays.

Usually, this problem is the result of a faulty temperature sender, or computer, but you do not state if the sensor was tested or replaced.

If you are SURE the temperature sensor (it's not a switch) is good, and the computer is good, you probably have a faulty relay.

Check your manual for the location of these relays and tap on them vigorously with a screwdriver handle...you may get lucky and find the offender. Otherwise, get another relay and replace them one at a time till you find the bad one.

If none of this works, you will need a REAL automotive electrician to diagnose the problem. Incidentally, I would not pay for new master computer if it didn't fix the problem !

Good luck

Posted on Sep 01, 2009

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Posted on Jan 02, 2017

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1 Answer

My car radio and AC fan are not working in toyota Avanza 2015, it started by fan running as soon the car is on immediately. May be is the fuse problem or what..


Hello Nceba Maqaqa,

We do not have a Toyota Avanza in the USA Market...

Looks to be a van/wagon style perhaps or Venza
would be close... (??).

In any case: IF...
the mechanical job (crank-shaft job) is related
to this incident... you NEED to be looking inside your engine compartment... for physical damage to your wiring...

POSSIBLY Your "MECHANIC" snagged a couple
of wires when pulling the engine ...
(and HOPEFULLY did a shabby job of repairing them..
(the shabbier the BETTER... EASY to find)).

A real "MECHANIC" would welcome the opportunity
to make sure you are a COMPLETELY SATISFIED
customer... Give that a try first.

ASK if there were any wiring "incidents" during the procedure

ELSE
You are left with tracing and toning out the wires: power distribution & possible FAN & RADIO cross-overs.

Tone tracing wires is a relatively EASY PROCEDURE...
(I use Klein tools - don't have time to mess with toys).

You do need wiring schematics... and you do need to
OPEN the circuit you are tracing (open = pull the fuse)...
to isolate the wire... (recommend FACTORY drawing).

2015 American market Toyota Venza schematic
drawings... are available FREE on BBB Industries site
(below)... REGISTRATION is required.

On the TYPICAL "entertainment" drawings found
for your year there are at least 3 and often 4 POWER
fuse circuits needed for your RADIO to function.
One (often two BATTERY sources, an accessory battery & an ignition battery.

I see no OPPORTUNITY for an EASY explanation
of your fan operating & radio NOT working... but
my first BACK trace would be of the FAN POWER... as
that logically would explain the fan symptom you described.

Hope this helps

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Why would a fuse be independant from the fuse box, and be hidden somewhere where it cant be found,and what does input shorted to the ground.


it means that either the power board in the inside unit is faulty and not sending messages to the power board on the compressor unit
if you didn't get the ac service agent out to do the checks, then any other electrician/ac mechanic will not be trained in the product
if you did get the service agent out then complain to the manufacturer about the faulty service

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I own a 1988 gmc c1500, the electric fan behind the rad is on constantly from the second i turn the key on until i shut it off. Wondering what may be causing this?


The fan is activated by the temperature sender and turns on when it reaches a preset temperature. Yours may be faulty so switches on at a low temperature so it needs replacing (the sender not the fan).
It is also possible that there is a wiring problem and the switch has somehow short circuited so is permanently live, meaning when you turn the key the fan starts.
If it has always done this, then it is also possible that a previous owner has done the short circuit, something I have done in the past but I put it through a switch that you activate when in traffic and the air flow is low. It might be worth tracing the wires from the sender to see if there is a switch somewhere in the cab.

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Smoke is rising from my steering column


You have a Shorting wire, you will have to dismantle the steering column to trace it. Disconnect your battery and do not drive it until you get it fixed.

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My cooling fan wont turn on and engin stays at normal temp. how do i know im getting a correct reading i did have to replace the radiator replaced


electric fans only run when it needs to. There should be a Thermal switch on the radiator. Short that switch to Ground and fans should run. Turn On AC and one fan should run.

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2002 Honda Civic...The car is overheating randomly. Replaced the thermostat,and fan relays. Car runs fine and then randomly overheats with gauge going way up and then sometimes coming down.Overheating and...


RADIATOR COOLING FAN NOT RUNNING COULD BE BAD ENGINE.COOLANT TEMPERATURE SENSOR IS FAULTY IF COOLING FAN IS NOT TURNING ON AT SET TEMPERATURE OF 196 TO 203 DEGRESS.CHECK SEE COOLING FAN RUNNING WHEN ENGINE RUNNING HOT.IF YES FLUSH RADIATOR , FLUSH ENGINE BLOCK, HEATER CORE,REPLACE RADIATOR CAP.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER IN THE COOLANT SYSTEM.CHECK WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP. IF COOLANT FAN DONT TURN ON 196 TO 203 DEGREES, YOU HAVE FAULTY COOLING FAN,SHORT IN FAN WIRING OR ENGINE COOLANT TEMPERATURE SENSOR FAULTY.IGNITION TIMING WILL CAUSE ENGINE TO OVER HEAT.

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1 Answer

This just began when I got in my vehicle this morning. Yesterday there was no issue. Turn signal fuse keeps blowing. This also causes the heater/air cabin fan to not run though the heat does warm up. ...


its called a short circuit ,that fuse saved you from the fire.
all blinker wires can be shorted, in every inch of car, all 4 corners.
even lamps can short,
why not get car fixed, its a very simple common electrical problem.
most fuses on the car are shared,
no 100 fuses. is why. no room for the 100
that means you cant fix cars electrics with out a schematic.

login to mitchells diy
and read.
its all there. any time, on USA cars.

no the reverse switch is not , its wires are
when you go to reverse the switch closes and the 2 lamps glow
this closure IS a short but is 100% normal
what is not normal are the wires shorting to ground or the lamps shorted.
those old lamps can short, the large base bulbs do that

we find shorts using an ammeter.
inspections of wires.
and first learn what shared path is shorted first.
then bark up that tree hard.

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Overheating water comeing out of bottol


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