Where can I find a diagram showing the coolant direct flow of the enigne, turbos, radiator, ast, etc. I have been looking in the bible sized version of the FSM and CANNOT seem to find it, which makes me believe it does not exist.....

 

I know it's in the Mazda RX-7 1993 Service Highlights (9999-95-045F-93)

I have a copy at home I could scan in for you. But I've seen it somewhere else too I thought...

 

use those handy FAQ's

from FAQ's under "C", cooling system diagram

http://www.autosportracetech.com/RX-7/coolingsystem.htm

 

I already saw that, thats a real generic pictorial of it. I am looking for something in more detail.

 

I have been doing more searching and no luck. So let me see if I can get this right.

Starting at the lower rad hose (this the coolants coolest state, right?) The coolant leaves the lower rad hose, up to the bottom of the water pump, then gets pumped through the 12-5 o'clock postion, spark plug side (looking at front of block). Some then flows to the TB, heater core and the rest gets routed back through the 6-12 o'clock postions? Then out to the left side of the water pump through the upper coolant hose to the radiator.

The ast has the hot coolant (leaving the block) run through it then down to the bottom of the rad, where that coolant does not cycle through the radiator, is that correct?

The turbos have fresh coolant from the radiator/water pump routed to the top of the turbos, which is then y'ed off, exiting through the passage on by the front compressor to the upper aluminum line running to the upper rad hose.

Did I get that right? Or am I way off?

 

???

 

Thats what it looks like from the diagram

 

Its not clear how the coolant flows through the rad, nor through the AST.

 

you are mostly correct. clarifications:

1) the TB return will go back through the radiator.

2) the heater core returns to the pump inlet pipe, bypassing the rad all the times with unrestricted flow. Dash dial just controls air flow to core.

3) the hot AST flow bypasses the rad. Stock unit has .08" orifice to restrict this bypass.

4) the turbos get HOT coolant from behind the t-stat, and returns it to the pump inlet pipe, bypassing the rad.

When engine is hot and t-stat is wide open, and rpms are not high, little flow is sent to the turbos or ast, esp with oversized rad.

I have a spare used wp assembly ... it tells all.

 

That's the same diagram that's in the Service Highlights manual. I doublt you'll find anything better than that.

Dave

 

is it normal to open up your radiator cap and not see coolant filled to the top?
ive been dumping coolant into my car and it seems to just be drinking that **** .. dont know how im missing so much coolant .. i must have dumped at least 3/4 a gallon into it .. now coolant is leaking out the over fill tank

 

" i must have dumped at least 3/4 a gallon into it "

search "overflow"

 

its not that .. before when i filled it and its full it tops off .. and the coolant stays at the top .. this time its just dropping .. rather than staying at the top

 

^ referring to the filler neck

 

Kevin -

With respect, due to the picture quality of the diagram, I find it difficult to tell from this diagram which way the water flows through the radiator. What I want to know where the hotest water point is. Currently my aftermarket temp gauge sensor is at the top input pipe of the radiator. It shows 108 degrees C when the fans first come on. This seems to be, (difficult to be sure), the low speed fan level. By various testing, I have confirmed absolutely that that this is the point where relays 2 and 4 swich on . According to all I have read, this is the point where the ECU switches ground to fan relays 2 and 4 and should be at around 103 degrees C. I need to understand the temperature discrepancy. Either (1) the aftermarket gauge is bad, or (2) the thermosensor is bad, or (3) there is a tempertaure difference between the aftermarket gauge sensing point, (top radiator hose), and the thermsensor sensing point (back of the water pump housing). This would have to be around 5 degrees C difference.

Any insight please?

Thanks

Dave

 

water flows in the top of the radiator then out the bottom to the water pump, then to thru the engine.

i think....

no wait, its the other way around...