Hiding between the posts
vs thermo fan playing up / questions
hey folks,
i changed the inlet manifold gasket today, drained cooling system new thermostat, new temp sensor to gauge ( holden revised one)
as i was bleeding the system it got up to 3/4 on gauge and the thermo fan didn't kick in.
i've done a search and have been fiddling around most of the night,
i unplugged the 2 pin sensor that goes to the ecu and the thermo fan goes full pelt after 15 secs so that means is it working normally? and the relays, fuses and wiring are good?
anything else i have forgotten to check?
the 2 pin sensor is a bit corroded on the outside so i'll go to holden and replace that tomorrow get the revised one
any help would be appreciated as this is doing my head in
thanks
two-bit
My VS Thermo fan doesn't kick in until 3/4 mark or so, unless I force it by turning on the AirCon. Did yours used to come on at a lower temp?
Real cars are steel cars.
^^
Normal driving 1/4
Heavy traffic; up to 1/2, fan comes on, back to 1/4, fan cuts out.
Heavy traffic with A/C on, 1/4
@two-bit
Have you bled out all the air?
If I told you I was a compulsive liar, would you believe me?
Donating Member
The above is not quite the way it should happen - the manual says that after you disconnect the sensor, the LOW speed fan should come on after 12 seconds and then a further 6 seconds the fan will switch to HIGH. The fan is 2 speed (I presume you mean the VS...not the VR?)Originally Posted by two-bit
This may mean that your LOW fan is not coming on when it should and this may be causing your temp to be high....check the low speed fan relay.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
Hiding between the posts
@ ccc mikey nope doesnt come on at all up to 3/4 on the gauge
@rx25se was bleeding out the air when i noticed it was up to 3/4 and the thermo hadn't kicked in
@hako sorry mate that what i mean low then high, yes i mean the vs checked all the relays under the bonnet etc thermo low or high is not coming on at all
when i refilled the cooling system i had the car up on a little angle, heater tap open rad cap off topping up the cooling system rad cap back on let car heat up thermostat opened so undid the bleed screw for a bit till coolant came through shut it then repeated a couple of times to make sure. gauge was at 3/4 my mate was like umm ryan its hot its just over 3/4 so we killed the motor let it cool then finished bleeding.
i replaced the 2 pin sensor today and went for a drive got to a little over half no thermo at all, backing in the drive way tonight from work i let the car sit there to heat up again to 3/4 thermo didn't turn on, BUT i pulled the fan out and tested it on both postive wires the one for low and one for high switched all the realys around with working ones back probed etc. error checked and it brought up Code 15 - Coolant temperature Sensor high voltage. when i turn the ac on the thermo doesn't turn on either and i have replaced that relay as well
Donating Member
Might be the actual thermo fan which is buggered - maybe hotwire the low and hi speed terminals on the fan itself to see if the fan works on low. If it's not coming on with A/C that would also point to fan - I guess you've checked all relays and fuses.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
Hiding between the posts
well dad came home sunday from his 4wd trip so we worked on the car today and monday,
un plugged fan checked it direct to battery low and high speed worked
checked thermo fan by un plugging the 2 pin sensor to the ecu after 6 seconds ran on low speed then went to high speed
checked the earth points
checked the wire the runs to the ecu from the 2 pin sensor, thats good.
removed the 2pin ecu sensor and put that in a pot of boiling water and measured the resistance it was between 150 and 300 ohm whilst boiling it up
between 2 and 3k ohms at room temp
took the car for a drive didn't get past 1/2 got home let it heat up a bit more got to 3/4 no fan got to 7/8 high speed kicked in and took it down to 3/4
plugged a water temp gauge onto the temp sensor and it read a 110 degrees
so dad and i have come to the conclusion that low speed must not be working?
does any body know what temp's the fan is suppose to come on at and switch to high speed?
and what the normal operating temperature in degrees?
Donating Member
This is from Gregorys manual:
Fan cut-in temperature:
low speed....above 104C
high speed....above 109C
Fan cut-out temperature:
low speed....below 99.5C
high speed...below 105C
The thermostat opens at 89-93C and is fully open at 106C.................and the radiator cap opening pressure is 1.35Kpa (or 20psi).
Just for info, with the standard Commodore cooling system in good order with the correct cap (1.35Kps) and the correct coolant (50-50glycol), the coolant will not boil till about 135C....so that really gives you a good safety margin.
Hope this helps.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
Hiding between the posts
Thank you very much Hako! rep ++
switched the ecu over put the old sensors back into the car went for a drive today and the low speed has decided to work again!
stopped the car whilst hot 3/4 came back 5 mins went to the on position and i could hear the fan whirring away so no idea
runs a bit hot for my liking so im gonna do a flush of the whole system and get some good coolant and mix it up properly and re fill.
thanks to every one thats helped
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