steve, thanks for the reply.so i just went out and checked it again. it worked last time and still works,but the vacuum signal is backwards.as i roll the temp dial i lose vacuum to hcv at cold and gain full vacuum at hot. may have the wrong heater control valve. with no vacuum the valve opens and there is full heat
some thing new to look at
thanks
rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car