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well, i posted recently about my 70'roadster and the problem with the headlights not working properly. since then i have replace both front relays and put new seals/boots on the actuators....the headlights now work perfectly, and for a couple of days, the wiper door worked perfectly also. popped up with the wipers, and also popped right up with the manual over-ride switch. now all of a sudden, the wiper door pops right up every time you start the car, and won't go down til you turn the car off. any ideas? doesn't matter whether wipers are on or off. is it a switch? doesn't seem to be a problem with the relay or actuator.....thanks for any help anyone might have to offer. rick
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Re: vacuum question/wiper door
To get the wiper door to open, you have to vent vac on the control line in order for the servo side to actuate the wiper door mechanism. Somewhere along the control line side (from the check valve into the cockpit, to the wiper door relay on the back of the tach, to the over-ride switch, and back out through the firewall to the wiper door vac relay), you're venting vac. Simple!
Now go find the leak... If you'd said the wiper door 'dances' when first start the car, but then settles down and closes, that'd be a different diagnosis (clogged vac filter, bad check valve are the typical culprits).... -
Re: vacuum question/wiper door
Hi Rick. It's a pain, believe me I know. Sometimes fixing one vacuum problem only reveals a new one.
My first thought was a mis-routed hose, but if it worked appropriately at first I doubt that's the problem. My guess is another vacuum leak somewhere, possibly caused when your previous repairs increased pressure on a different, weak vacuum link.
I'd check the wiper solenoid which is screwed to the bottom of the Tach, and I think is in-line with one of the hoses coming from one of the override switches. The solenoid is part electric and helps govern the flow of vacuum to the wiper door, and when mine malfunctioned and leaked it caused odd problems like yours. I also had a cracked nipple on one of the override switches, causing further loss of vacuum.
I'm sure others with much more knowledgeable than me will chime in shorty.
Good luck, Patrick Moresi #45581Comment
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