I started my 89 300 ce this morning, I heard a little tick, tick,tick noise right in front of me. It sounded like turning signal. I checked with the signal light. .It was not on and not turning signal. Few seconds later, the noise gone. I shut off engine and started again. The noise came back and few seconds later gone. Can anyone tell me what is it? Is it a serious problem down the road?

If the sound is close to the glove box, it's the climate control switchover valve changing modes. Starts off in AC, full recirc if the sun has been on the car and the temp sensor is hot, then switches off the recirc, then the AC as the air in the car goes over the temp sensor and cools it off.

If it starts clicking continuously, it's time to fix the blower for the temp sensor.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

No, the sound from the driver side.