Take it to the body shop. They have to open the hoods when they are wrecked.
With a pair of pliers pulling the latch.
Pull on it with a pliers or locking pliers. This happened to me after a couple days of extreme cold.
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back of the block get to it from under the car use oil filter pliers not a slide wrench
Your car is VTEC already.
try pulling the fuse out
I'm not certain how it's done on a Civic, but most cars can be reset by pulling the battery cable (hot/red) and letting it sit for an hour or so. This has worked for me in the past.
Not possible with factory equipment, by design.
try pulling out the dash. there should be a cable of some sort back there. spray some WD40 on it.
It can be done for some models. Is there already AC on the '90 civic? If not it will require some effort but it is definitely not impossible.
the replacement filter is behind the glove compartment, you can access it by pulling down the glove compartment,
Remove the splash shield from underneath the car; the pepcock should be located at the bottom of the radiator. It may require using pliers to turn the pepcock.