I Finally got my t5 running after half a year of an engine rebuild. Right when i got it running the boost was on and it had full boost. but after a few weeks it is now limited boost. I put a new 19t compressor and housing and blow off valve. I think that the vacuum lines are good doesnt seem like thats it what else could cause it? also my transmission would run fine then id park it and it would start off in a higher gear. like in winter mode. there is a flashing arrow on the dash but now check engine light. And my cooling fan isnt kicking in. I checked the voltage on the hot wire when the ignition is on and there was non. I tried connecting the relay directly to the battery and still nothing. please help me!!

 

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Sounds like you are describing multiple problems. It make the thread kind of confusing. It's best to make 1 thread per problem.