My '68 280SE is blowing fluid out the vent holes on the top of the reservoir each time the steering is returned to center. The local mechanics are stumped. I'm guessing the steering box is to blame. What is the recommended course of action?

I had the same thing happen when the fluid level got low in the resevoir. After I topped up the fluid, everytime I turned the wheel, I blew fluid out the vents.

Sounds to me like air in the system. Let the car rest a bit, top off the fluid then you need to bleed the system. There is a bleeder screw on the top of the steering box, crack it open, put a piece of tight fitting rubber hose on, run it to the resevoir and start the engine, but DO NOT turn the wheel. Let it idle until the fluid run clear of any air.

Or, you can top up, start the engine and VERY slowly turn the wheel stop to stop. One direction will cause the level to drop, the opposite direction will raise the level. Once the fluid is clear of air bubbles, the system is purged and should no longer blow out the vents.

Next you need to find out where you are losing fluid. Front pump seal, steering box, low pressure return line??? If it's the return line I have an easy fix for it posted in the Vintage forum titled "handy little tip", try a serach. Keep an eye on the fluid level and keep it topped up, find and fix your leak.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.

Mike...thanks for the instant response! I was trying to locate the source of a leak long before the reservoir started spraying. The fluid must have gotten too low and allowed air in the system. Since fluid is sprayed everywhere I will have to clean up under the hood to find the original leak. I will follow your advice.
Thanks!