overheats at startup/vent,then OK???
 

One of my motors gets NO water until I remove one of the hoses going to the exhaust from the thermostat housing(aftermarket). I run a crossover peice and have great pressure 25psi after but none at idle. I may have hurt my impellor but it is new as is the plastic housing. Do the little balls on a spring in the stock housing keep the water in the motor after shutdown? Seems vapor locked or something??My therm-stat housing only has 2 out for the exhaust.Like I said,if I remove one hose,let it run a few secs it starts to circ then I am good for the day. Next day ,same prob,same fix. Just a weak pump? I don't know. My stat has 4x1/8" holes drilled in the edge and is a 140 deg.

Re: overheats at startup/vent,then OK???
 

Do you have a bypass on the Cross over?

Jon

Re: overheats at startup/vent,then OK???
 

nope. The other motor is set up the same. Hasn't been a prob until lately. Can a weak pump do this and still create 25 psi at speed?

Re: overheats at startup/vent,then OK???
 

OK,Pump is perfect,just took it apart. You can feel it pulsing air and if you remove one of the hoses from therm-stat housing and after it gets hot and you rev it up a few times HOT water comes thru then it's good for the day. Show 0 at idle and up to 30 psi at speed. Confused.........

Re: overheats at startup/vent,then OK???
 

Sucking air anywhere? May be a slight leak at in the hose on the pull side. An air leak could make it harder to prime.

Re: overheats at startup/vent,then OK???
 

That's what I wondered. I'll have to tighten evrything and try some more