Lt1 Fiero Owners. (Page 13/16)
str8maxn APR 28, 10:49 AM

quote
Originally posted by cyrus88:

I'm running 3-core champion radiator, stock fan and shroud. Car runs cool as a cucumber.

couple of questions: do you have the heater hose routed correctly? Is the steam line from the back of the heads installed and routed appropriately?

If I were you I would eliminate the stock water pump and use hose adapters.


I didn't route the lines myself. I can only assume that the last owner did route them correctly. I should raise the rear end again and burp the system to make sure I don't have air in the system.

With regards to the adaptors, I was going to go this route but the routing has me very confused. thus I when with the stock water pump.

Are you aware of any V8's running the stock radiator?
Do you have to remove the front hood to install a new radiator?
cyrus88 APR 28, 02:34 PM
There are people on this forum who are runnign the stock rad with V8, but I don't remember who.

You don't have to remove the hood to replace radiator.

I wouldn't assume the previous owner knew what he or she was doing regarding the cooling system. Verify everything.
str8maxn APR 28, 02:57 PM

quote
Originally posted by cyrus88:

There are people on this forum who are runnign the stock rad with V8, but I don't remember who.

You don't have to remove the hood to replace radiator.

I wouldn't assume the previous owner knew what he or she was doing regarding the cooling system. Verify everything.




I think I may have air in the system..... I ran another test just now

Outside Temp is in the low 60's ...

Ran the car for about 10 minutes
Before \ NOW
157 \ 149 Degrees >> Top Inlet of the stock Fiero radiator.
120 \ 146 Degrees >> At the radiator cap
152 \ 100 Degrees >> At the rear pipe before entering the stock water pump housing
187 \ 222 Degrees >> Rear corvette reserve tank
217 \ 202 Degrees >> At the rear facing cylinder Head
Max out >> stock Fiero temp gauge

Note I had the pump in test mode 100% cycle \ Fan On

once I turn the car off... the over flow tank gets full and dumps out the cap .

Air in the system?
cyrus88 APR 28, 09:09 PM
Coolant dumping from the tank after engine off is probably due to heat soak, unless you have the vented radiator cap (assuming you're referring to the stock overflow) that allows coolant to flow out of the radiator. If it's not a vented radiator cap, then it probably still has flow problems and the engine is getting pretty hot.

Did you check you temperature sensor and wiring to make sure they are good?

[This message has been edited by cyrus88 (edited 04-28-2022).]

str8maxn APR 28, 11:45 PM

quote
Originally posted by cyrus88:

Coolant dumping from the tank after engine off is probably due to heat soak, unless you have the vented radiator cap (assuming you're referring to the stock overflow) that allows coolant to flow out of the radiator. If it's not a vented radiator cap, then it probably still has flow problems and the engine is getting pretty hot.

Did you check you temperature sensor and wiring to make sure they are good?





It's the stock over flow tank that has a vented cap. The overflow tank over fills and dumps out the vented cap.

I am planning on getting a new water temperature sensor this weekend. Time permitting.

Is there a way to test the wires?
cyrus88 APR 28, 11:59 PM
Just to be clear, by stock overflow tank, I mean the stock Fiero tank, not a Camaro or Vette tank.

If it's the Fiero tank, then the radiator cap should be a non-vented one. Do a search on this forum for the correct part number for it.

There should only be one wire to the sensor. Do a visual for fraying, cracking, poor connection etc.

[This message has been edited by cyrus88 (edited 04-29-2022).]

str8maxn MAY 01, 05:17 PM
There should only be one wire to the sensor. Do a visual for fraying, cracking, poor connection etc.



Just to be clear, by stock overflow tank, I mean the stock Fiero tank, not a Camaro or Vette tank. >>>>> Correct. the fiero front stock tank. It fills up and pours out the vented cap. I also have the stock vette tank in the rear.



Here is what my cap looks like:




Replace?


I did find one wire that was melted but it appears to be an oil pressure or temperature. I fixed it and re-routed it . It's located on the lower side of the block facing the rear bumper. I ordered new O2 sensors pending installation.
Only the outter connecter is melted a little the wires at the are OK. Circled connector







What do you think these sensor are?

[This message has been edited by str8maxn (edited 05-01-2022).]

str8maxn MAY 01, 05:42 PM
BTW- I ordered a 3 row radiator from champion.

I just want to solve these overheating issues.
cyrus88 MAY 01, 08:07 PM
Okay, I am talking about the RADIATOR cap being vented or non-vented, not the overflow cap.

The temp sensor in the water pump is for the PCM. The gauge gets the temp from the sensor in the head. Normally, on the LT-1, the sensor is in the left cylinder head (so it's close to the water pump), but I don't know what the previous owner did with your engine.

I can't tell from your last picture what those sensors are, or what they're supposed to measure.
str8maxn MAY 01, 11:08 PM
Ahhhh ... the radiator has an after market radiator cap that has temp gauge built into it.

ThermoCap


like this one.
Cap