Blowing engine control fuse on 94 grand cherokee

Fuse #15 powers the safety shut down relay in the power distribution center and the transmission control module. Remove the Safety shutdown relay and see if the fuse stops blowing. If it does, then disoconnect the connector to the trans control module. If it still blows, you've got a short in the PDC or wiring harness.

Get yourself a set of factory wiring diagrams,
otherwise your wasting your time

You have no idea what you working on, without
reference material

Helm.Com

Check your exhaust many times it'll be a o2 sensor wire touching the manifold causing the short to ground. Start there let us know. Hope this helps.

check all the fuses before you do anything else. After all a fuse provides power to the electronic box that controls the transmission. Other than that I would not advice on a more complicated troubleshooting since there is no way for you to test a bad transmission computer, even mechanic shops don't know how to test them. The only thing they would do is slap a known good one and see what happens.

its a safty device that burnes out if there is a short somewhere in the wiring or object.

first place I'd look is around the perimeter of the heads (I assume you mean head gaskets?) Make sure you haven't inadvertently gotten a wire pinched in between the head & block somewhere.

Pretty sure I have answered this about a million times. Blower motor is on engine side of firewall on passenger side. You can run a hot lead to it to check if it's working! You did check fuse... Right?

1994 is the same as 1997. parts are interchangeable

no it wont work.they made too many changes with them about 2 years older and id say yes but no they wont interchange

If it is the fuse for major engine control electronics that is blowing (PCM, etc.) as soon after energizing, try disconnecting the O2 sensors. The 12V heater in the sensor could be shorting to ground.