thermo switch or temperature sender on a 4d56

[miked]

anyone who can tell kung yung switch ba o sensor yung isa na single contact na nasa cylinder head ng 4d56. the double contact is the temperature sender while yung part in question have never been tapped into the circuit of the vehicle since acquisition. ngayon ko lang napansin. its location is just beside the engine hanger.

hijacked this photo from pocuk.com
http://i217.photobucket.com/albums/c...t/DSC01597.jpg

some say it's a temp sensor for the fuel system during cold starts, temp sensor for the O/D of the A/T, etc.

did a resistance test myself. zero ohms (ON) when cold, XXX ohms when hot (forgot the reading, sorry). i am planning to install a thermo switch connected with the aux fan in place of this sensor. my auxiliary fan is tapped to the A/C at present.

tia

[miked]

the sensor on the right of the pic is my inquiry.

[t2erns]

the sensor on the right of the pic is my inquiry.

not familiar with it, but you can check continuity to ground. pag walang continuity pag cold and magkaroon pag uminit na then it's a thermo switch. you can also check kung meron naka stamp na temperature sa body ng sensor.

[miked]

baliktad eh. continuous (on) when cold. increasing resistance when getting hot. thus hindi sya switch. i'm searching for a switch with the same thread pattern in the range of 90-95 or 95-100C that will fit in the same location. MB435745 at MB660664 pa lang ang nahahanap ko sa net kaso not the same diameter afaik.

[oj88]

Based on some bit of research, the two-prong temp sensor on the left is what tells the glow control module how long the glow plugs should warm up (lower measured coolant temp = cold engine = longer glow plug operation, and vice versa). The single-prong temp sensor on the right is supposed to be the one that's connected to the dashboard temp gauge.

The following shop manual might help. Refer to pages 44, 48 and 50 of the document: http://www.google.com.ph/url?sa=t&rc...TZMpOY7pO3gwpg

[b0y37]

Hey guys, buhayin ko lang yung thread. Lately, hindi na umaangat yung temp gauge ko. I need to know the location of the coolant temp sensor. Itest ko kung eto yung sira, or yung gauge na mismo.



TIA.

[yapoy86]

kung single wire yung B, yan yung temp sensor, yung A para sa glow plug control

pwede mo i-dikit sa ground yang wire na yan to check yung buo yung gauge mo sa panel, dikit mo lang saglit sisipa yung gauge nyan

[b0y37]

kung single wire yung B, yan yung temp sensor, yung A para sa glow plug control

pwede mo i-dikit sa ground yang wire na yan to check yung buo yung gauge mo sa panel, dikit mo lang saglit sisipa yung gauge nyan

Two-wire sya sir. Btw, my car is Adventure diesel.

[yapoy86]

may isa pa dun sa gilid (left side).. try to test the resistance of the sensor baka open na yan or place a jumper wire dun sa connector and check kung aangat yung gauge mo

[b0y37]

may isa pa dun sa gilid (left side).. try to test the resistance of the sensor baka open na yan or place a jumper wire dun sa connector and check kung aangat yung gauge mo

Left side ng engine sir? Malapit ba dun sa lower rad hose (near alternator)?

[yapoy86]

hindi left side dyan sa last pic mo (same engine ba yung first and second pic?).. yung nasa alternator malapit oil pressure sending unit yun..

dun sa first pic yung malapit sa glow plugs ang para sa heater control, yung nakatutok sa radiator hose ang temp gauge sensor

[b0y37]

Sinubukan ko hugutin yung plug connecting dun sa second pic, wala namang reaction sa temp gauge ko. Ang napansin ko lang, hindi nageengage yung compressor ng AC pag nakabunot yun. Sinubukan ko rin tanggalin yung connection sa instrument panel (2 set ng connectors). Pag yung left side connector lang ang nakakabit, pumapalo hanggang taas (lagpas sa level ng HOT) yung needle, meaning hindi sira yung gauge ko, tama ba?

[miked]

Sinubukan ko hugutin yung plug connecting dun sa second pic, wala namang reaction sa temp gauge ko. Ang napansin ko lang, hindi nageengage yung compressor ng AC pag nakabunot yun. Sinubukan ko rin tanggalin yung connection sa instrument panel (2 set ng connectors). Pag yung left side connector lang ang nakakabit, pumapalo hanggang taas (lagpas sa level ng HOT) yung needle, meaning hindi sira yung gauge ko, tama ba?

kagulat nabuhay uli ang thread ko.

btw, i figured out yung query ko dito sa thread ko. it's a cut-off switch sa airconditioning system once na magoverheat na coolant. above 108 deg celsius ang cut-off nya accdg to pdf files na nakuha ko sa internet.

with regards sa query ni boy37, either cut-off switch din yan sa A/C system (shut-off nya A/C in other words beyond its set temp reading) or electric cooling fan switch iyan.

sa tulong ng multitester in the ohms range, cut-off yan kung zero ohms (cold) at increasing resistance habang painit ang coolant. fan switch yan kung high resistance when cold tapos decreasing ang resistance habang painit ang coolant.

yung temperature sensor nung sakin ay yung letter "A" sa pic mo. double contanct din.

[christian p]

i have a mitsubishi l300 and temp gauge doesnt work at all. can somebody review my photo?


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[ikong]

kagulat nabuhay uli ang thread ko.

btw, i figured out yung query ko dito sa thread ko. it's a cut-off switch sa airconditioning system once na magoverheat na coolant. above 108 deg celsius ang cut-off nya accdg to pdf files na nakuha ko sa internet.

with regards sa query ni boy37, either cut-off switch din yan sa A/C system (shut-off nya A/C in other words beyond its set temp reading) or electric cooling fan switch iyan.

sa tulong ng multitester in the ohms range, cut-off yan kung zero ohms (cold) at increasing resistance habang painit ang coolant. fan switch yan kung high resistance when cold tapos decreasing ang resistance habang painit ang coolant.

yung temperature sensor nung sakin ay yung letter "A" sa pic mo. double contanct din.

Sir, yung isang mga wire papunta saan? Yung isang wire traced ko na. Dinikit ko sa ground, pumalo yung temp guage. Hinahanap ko pa yung isa. Ang pqob ko. Tatlo silang wire kasama nung na traced kong isa. Pa help. TIA

[teamtraitor]

Pasensya na binuhay ko tong thread.

Yung L200 1998 ko kasi ayaw mag engage ng compressor at walang lamig ang aircon.
Hindi rin tumataas yung menor pag pinindot ko yung AC ON button.
Pag sira ba tong temperature sender sa 4D56 hindi din gagana yung idle up or mag engage yung sa compressor?


Sabi kasi ng mekaniko need daw new compressor, sabi ng isa shaft seal daw. Nag basa ako at check sa youtube and nakita ko na
may mga video na temperature sending unit daw muna tingnan. Kasi daw if sira di daw gagana yung compressor at yung menor. Totoo ba?


Paano nyo na fix yung sa inyu?

[dr. d]

Pasensya na binuhay ko tong thread.

Yung L200 1998 ko kasi ayaw mag engage ng compressor at walang lamig ang aircon.
Hindi rin tumataas yung menor pag pinindot ko yung AC ON button.
Pag sira ba tong temperature sender sa 4D56 hindi din gagana yung idle up or mag engage yung sa compressor?


Sabi kasi ng mekaniko need daw new compressor, sabi ng isa shaft seal daw. Nag basa ako at check sa youtube and nakita ko na
may mga video na temperature sending unit daw muna tingnan. Kasi daw if sira di daw gagana yung compressor at yung menor. Totoo ba?


Paano nyo na fix yung sa inyu?

a generic possibility.

is the washers about the center of the compressor.
binabawasan lang po iyan, para kumagat ulit ang clutch.

[teamtraitor]

Pasensya na binuhay ko tong thread.

Yung L200 1998 ko kasi ayaw mag engage ng compressor at walang lamig ang aircon.
Hindi rin tumataas yung menor pag pinindot ko yung AC ON button.
Pag sira ba tong temperature sender sa 4D56 hindi din gagana yung idle up or mag engage yung sa compressor?


Sabi kasi ng mekaniko need daw new compressor, sabi ng isa shaft seal daw. Nag basa ako at check sa youtube and nakita ko na
may mga video na temperature sending unit daw muna tingnan. Kasi daw if sira di daw gagana yung compressor at yung menor. Totoo ba?


Paano nyo na fix yung sa inyu?

BTW. The story pala is that while I left the car idle for around 20 minutes naka ON ang AC pagbalik ko I heard sa soft leaking sound and a sudden soft blow (parang gulong ng kotse na leak)
and may nakita ako usok sa hood. Pinatay ko agad yung engine then upon opening sa hood wala na ako makita na umuusok. Kinabahan ako kasi akala ko baka nag overheat yung engine ko.
After a while pag ON ko nag start naman yung makina and that is the time napansin ko wala ng lamig yung AC tapos yung compressor din di na umiikot.

Hirap kasi maghanap dito sa area ko ng magaling mag diagnose or mag ayos.

[dr. d]

BTW. The story pala is that while I left the car idle for around 20 minutes naka ON ang AC pagbalik ko I heard sa soft leaking sound and a sudden soft blow (parang gulong ng kotse na leak)
and may nakita ako usok sa hood. Pinatay ko agad yung engine then upon opening sa hood wala na ako makita na umuusok. Kinabahan ako kasi akala ko baka nag overheat yung engine ko.
After a while pag ON ko nag start naman yung makina and that is the time napansin ko wala ng lamig yung AC tapos yung compressor din di na umiikot.

Hirap kasi maghanap dito sa area ko ng magaling mag diagnose or mag ayos.

sounds like the classic aircon freon leak. and it is probably not the evaporator under the dash.
car aircons are usually de-cajon.
any decent car aircon shop should be able to help you.
sana mura lang ang pa-repair or replace nang leaking part.