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Well, More information would be helpful like the year and model of your van. Most blower motors are accesed through the firewall from my experience. I owned a 1978 Chevy G-10 .Please provide more model specific information. Thankyou
It depends if it is a classic or new style Silverado. Both were made in 2007. If it is a classic Silveradothere is a replaceable relay in the under hood fuse block. If it is a new style Silverado the horn relay is part of the printed circuit board that is only available with UBEC (under hood bussed electrical center).
Raise the hood and look for two small screws on the headlight, one is closer to the radiator for side to side adjustment and the other is for up and down adjustment.
the traditional way of setting your timing would be better, get a loan of a timing light, the sticker under your hood should tell you the spec. usually 10-12 degrees btdc at idle with the timing advance disconnected. the timing advance is a tan wire with a black stripe usually found behind a plastic relay cover on the upper passenger side of the firewall near the distributor. there will be 3 plastic nuts holding the cover. you can mark the harmonic balancer tdc with liquid paper so it is easier 2 see with the light.
the oil depends on how many miles are on it and where you live. In a cold climate with low milage it should be 0-30 or 5-30 with higher milage 10-30 or 10-40 in warmer climates low milage 5-30 or 10-30 higher milage 10-40
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