Help! Can't fix temp overshooting

[SDHNTR]

88 22re with brand new motor. Got a temp overshooting condition that only happens with heater valve open. I tried installing the TSB recommended dual stage thermostat and it still happens. What now? I don't like my new motor overheating at all, even if just for a minute.

 

[Bad_Vision]

check to make sure hoses are correctly routed with the valve open you may be blocking something you need to be open.

 

[SDHNTR]

Yeah, already did that, and checked all the easy stuff.

 

[cometobanks]

My rock crawler has always done that even when it was my daily driver... I wish I could say I figured it out. It hasn't happened since I removed the heater core.... Thats not a great solution for you sorry

 

[fourwd1]

As long as the temp comes back down to normal, it's not a big problem.

 

[SDHNTR]

It does come back down to normal within a minute. It just bothers me. You don't think I am causing any kind of real long term problems? I just spend good coin on this new motor and cut no corners. I really want it to last. The odd thing is that this never happened with the original motor. Not sure why the new one would cause this to happen.