my 88 3800 swap has the heater core worked like this wonding if this will work I am having a hard time bleeding it
So i am running stock 3800 thermostat , LIM port sealed , and i have a 3/8 barbed fitting out of my water pump as feed and the return line is T off to right side coolant pipe
in the drawing the circle off the heater core line basicly goes to my fitting on my water pump
make sence to me but want to be sure !!

[This message has been edited by RULOOKIN (edited 05-27-2011).]

Your heater core feed needs to be off the LIM, the waterpump is the return side.

quote Originally posted by Mike Gonzalez: Your heater core feed needs to be off the LIM, the waterpump is the return side.

I have told you this at least 3 times OP.. Why are you making another thread about it?

Still cant find the answers i am looking for i realy dont want to drill into my LIM as it is sealed if the way i have routed this is incorrect what are my opptions posibly a fiero T stat houseing with feed to heater core from that and plug the fitting off my water pump ???

[This message has been edited by RULOOKIN (edited 05-28-2011).]

quote Originally posted by RULOOKIN: Still cant find the answers i am looking for i realy dont want to drill into my LIM as it is sealed if the way i have routed this is incorrect what are my opptions posibly a fiero T stat houseing with feed to heater core from that and plug the fitting off my water pump ???

Yes, you will need a modified Fiero T-stat housing with the heater outlet below the T-stat if you dont want to use the LIM feed. And the plug the waterpump return.

Spoke with Loyd from fast fieros and he said same thing block the water pump and run a modified fireo T stat !!
For now i will be blocking heater core ,pulging return line on water pump so no heat for now till i get a T stat someone was selling these in the mall recently

You cant do that ! The heater core acts as a path for the coolant to move untill the T-stat opens. Without the flow it will overheat quickly.

quote Originally posted by Mike Gonzalez: You cant do that ! The heater core acts as a path for the coolant to move untill the T-stat opens. Without the flow it will overheat quickly.

i am running a drilled thermostat for now but have ordered the BMWGUROs custom t stat houseing for 3800 so should get tings figured out soner or later

On all the swaps we build, we run the heater core line from the modified thermostat housing and use the stock 87-88 heater core line in the passenger side coolant tube. On pre 1987 models, we TIG weld a stainless steel fitting into the passenger side pipe to simulate the 87-88 heater core setup. This keeps the engine bay cleaner looking.
Dave

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