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#1
06-08-2006, 05:07 PM
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A/c doesn't work, Tach intermitant
I am having a proplem with a 87 300D turbo. Tachometer only works when engine is cold. then tach quits when the engine warms up and so does A/C. I have replaced the Climate Control unit. That fixed some other problems with A/C-Heat control, but not that problem. A/C works fine when Tach works, but no A/C when the tach is inop.
I can rev the car up 3000+ and the tach will start working when engine hot Anybody out there know what controls the tach. Is it possibly return signal in the Intrument cluster. Any help would be greatly appreciated. 
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#2
06-08-2006, 06:07 PM
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I don't know exactly what it is, but if it were me, I would guess that a fuse, or some other electrical connection has either a hairline crack or is dirty or ??, and that once it gets warm enough, thermal expansion gives sufficient contact. So, I would be checking fuses and electrical connections with a fine toothed comb.
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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D
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#3
06-08-2006, 07:47 PM
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Try the overvoltage protection relay or klima relay. They are behind the battery if you remove the plastic shroud in the firewall region.
__________________
-disav 99 E300 TURBODIESEL Astral Silver 282K - AMG brakes, suspension, monoblocks, speedo & interior - Full Load Maxed on IP by custom Speed Tuning USA Chip - T3/T4 Garrett - EGR/MAF delete 98 E300 TURBODIESEL Alexandrite Green on black leather 289K 95 E300 DIESEL Green Queen 267K SOLD 84 300D 216k SOLD 87 300D 299K #22 head - intercooler - full load adj. - 8sec 0-60mph - SOLD 76 300D 214K SOLD
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#5
06-08-2006, 09:26 PM
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It is next to the ovp relay.
__________________
-disav 99 E300 TURBODIESEL Astral Silver 282K - AMG brakes, suspension, monoblocks, speedo & interior - Full Load Maxed on IP by custom Speed Tuning USA Chip - T3/T4 Garrett - EGR/MAF delete 98 E300 TURBODIESEL Alexandrite Green on black leather 289K 95 E300 DIESEL Green Queen 267K SOLD 84 300D 216k SOLD 87 300D 299K #22 head - intercooler - full load adj. - 8sec 0-60mph - SOLD 76 300D 214K SOLD
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