testing radiator temp sensor/switch

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Dougal
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Posts: 1212
Joined: 16 Mar 2011, 21:41
State: New South Wales
Model: Magna TS 1995
Engine: 3.0-Litre 6G72 V6 24V DOHC
Transmission: 5 Speed Manual
Location: Sydney, North West

testing radiator temp sensor/switch

Post by Dougal »

Hey all,

Need some advise here.

Radiator fans not coming on in the 2nd gen.
Fans work when probed power and ground pins on the fan motor harness.

How do i test the sensor/switch at the bottom of the radiator?

How does the sensor and switch work to turning on rad fans high/low?
I see that there is fuse and fusible links in the relay/fuse box in the engine compartment so im not sure if to test there also for a broken circuit caused by a bad fuse.
ModifiedMitsubishi /// Administrator

Proud owner of
2nd gen Magna TS 1995 - 3lt Twin Turbo 6G72 DOHC 5spd manual)
3rd gen Magna TJ VRX 2002 Wasp Yellow 6g74 SOHC

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magna buff
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Joined: 21 Jul 2006, 22:37
State: Queensland
Model: TP magna
Engine: 2.6-Litre 4G54/Astron II 8V I4
Transmission: 4 Speed Straight-Shift Automatic
Location: Ipswich Qld

Re: testing radiator temp sensor/switch

Post by magna buff »

........sorry about the side view but from the repair manual
two types of thermo switch one for a 4 and one for the 6
TR-TS,KR-KS.pdf
(73.13 KiB) Downloaded 291 times
l.

ok you put the sensor in water but not the plastic part ' just like the thermostat just not submerged

how you hold it part way out the water when hot and also test is not explained

then check the ohms book says 85 deg c =- 3 it should have a circuit

if when cooling the circuit fails 81 deg c it has to be replaced

yes test at the fuses for a full circuit

yes there is a fan relay

Didnt know they had a hi/ low just air con fan comes.. on with air con and motor fan with the sensor ... no hi low fan system mentioned in repair manual
Last edited by magna buff on 17 May 2014, 21:50, edited 1 time in total.
TM-TP Magna Specialist

User avatar
Dougal
Administrator
Posts: 1212
Joined: 16 Mar 2011, 21:41
State: New South Wales
Model: Magna TS 1995
Engine: 3.0-Litre 6G72 V6 24V DOHC
Transmission: 5 Speed Manual
Location: Sydney, North West

Re: testing radiator temp sensor/switch

Post by Dougal »

Thank you mate!
This helps!

Bit of an odd thing is that my sensor has 2 pins.(I'm guessing one is power and the other ground)
The TR/TS manual shows a single pin sensor (suggesting ground isn't a pin but rather ground is by the unit itself.

I swapped the radiator some months ago and think I put a sensor from a 3rd Gen in.the radiator. I recall seeing the single Slide pin on the old sensor instead of two pins in the current one. (Dont know why i didnt think to put the old one in the new radiator) :oops:
I will dig around for the old one to test and use if its ok.
ModifiedMitsubishi /// Administrator

Proud owner of
2nd gen Magna TS 1995 - 3lt Twin Turbo 6G72 DOHC 5spd manual)
3rd gen Magna TJ VRX 2002 Wasp Yellow 6g74 SOHC

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magna buff
Senior Member
Posts: 1125
Joined: 21 Jul 2006, 22:37
State: Queensland
Model: TP magna
Engine: 2.6-Litre 4G54/Astron II 8V I4
Transmission: 4 Speed Straight-Shift Automatic
Location: Ipswich Qld

Re: testing radiator temp sensor/switch

Post by magna buff »

there are two types shown in the manuals

two pins in the 4 cyl manual the one in pdf suggests a 6 cyl ... both have the same heat specs for testing

two pins just means you put the ohmn meter probes on each pin

over time they could be superceeded
TM-TP Magna Specialist

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