were is the temperature gauge relay on a 80 300D ?

No relay, just a sending unit located at the front of the engine.

__________________
LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold

I replace both sender on the motor there are 2 senders on the side of the motor next to the glow plugs but the gauge won't read I also not sure if the fan in front is working not seen it kick on the gauge also been replace

the two senders next to the glow plugs are for the glow plugs.
one goes to the glowplug relay, the other to the glowplug light.

the fan is used by the airconditioner unless it has been rewired.
only when the a/c gets hot.

don

Thanks if the 2 sender are for glow plugs then were the one for the temp I don't see any other one the A/C is unhook it die some time ago I seen the fan run when it been real hot out after a hard drive

temp senser: front left of engine directly behind the upper
radiator hose, single wire with black push-on cap.

don

No the only sender on the motor are the one by the glow plugs that it they check out good I was reading that the glow plugs relay has a temp sender made in

The service manual for the 80 300D shows the temperature sensor for the aux fan is used by the AC system. The switch is located on the reciever dryer. The relay for the aux fan is the code 6. It should be located on the driver wheel well in the black box , not 100% sure which one it is. Here is the general location

http://www.************************/BitMapPage.aspx?bitmapid=130&bitmapname=Electric%20Control%20Relays

Both relays will be "icecubes" type relays. One is for the windows and the other is for the aux fan.

Your actual temperature sensor for the guage is the forwad one in the block. Near the glow plugs. Item #76

http://www.************************/BitMapPage.aspx?bitmapid=75&bitmapname=External%20Engine

This is wired directly to the instrument cluster.

Dave

__________________
1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

Thanks for the help noting I try work the sender seem to be good there power going to it I replace the instrument cluster
it stop working with the old instrument cluster it stop working about the time I clean the motor at the carwash I about ready to just buy a add on guage