cooling issue cont.

[jb welda]

so then via your calibration method, approx what is the temp when the needle is on the very bottom of the red zone? im pretty sure all would be very similar if not identical so maybe you can help me shortcut the process. i prefer mechanical temp guages that indicate actual temp but im living with my stock gauge for now.

ps: as mentioned above any motor that is shut off with get hotter before it gets cooler due to the lack of circulation. ditto with an idling motor: there is little air flow over it because you are not moving through the air. true the fan will supply some airflow but not enough to really keep a motor cool on a hot day sitting idling for a long time.

im kind of skeptical about the stock temp gauge: when i run my sbc on the freeway up hills the temp goes almost to the red but then stabilizes and stays put still in the clear but definately upper clear zone. but as soon as i head downhill or dont put so much stress on the motor the guage goes down almost into the "cold" range. seems to do that too quickly so i suspect the operating range for the gauge (the area between cold and hot) is kinda small like maybe only 20 degrees or something. ive never used a thermometer to calibrate it though hence my question above. btw im running a 160 degree thermostat as recommended by the chip manufacturer for the tbi ecm im using.

one love
jah bill

 

[FJ60_cruiser]

sorry dude, yep misunderstood. If you were idling and it went up like that. Yes, I would agree that you either have a bad fan clutch or maybe bubbles. When my temp goes up above the 180 mark i'm assuming I can hear the fan kick on and notice the air sucking stronger and blowing harder. You should be able to notice with the hood up.

don't worry it's ok, anyway thank's for the coments. i really apreciate your help!

 

[Tarrazu Tico]

OK I went in to replace the top radiator hose. With the hose off coolant keeps streaming out of the thermostat housing. Not a lot but it does. I assume this is why I seem to have contiuous pressure in that top hose.

When I recently replaced that thermostat and seal I had noticed that the last seal had blown, probally exactly like this one has. Just for an opinion, do you think the therm. is not opening when it should?

Should I try the lower temp thermostat or just keep buying until I find one that works?

I'll try and make some time to test that themostat this week.

 

[beaufort-fj60]

it's just wax that melts and lets the thermo open up. which side do you have up, maybe it's in upsidedown

 

[FJ40_owner]

Tstat

Always verify a new stat works. Put it in a pot of water and bring it to a boil. Watch the stat open. Verify it opens at the designed temperature using a good thermometer. I do the same with my mechanical gage as well.

Also I put a small amount of gasket sealer around my stat housing prior to installation.

JB

OK I went in to replace the top radiator hose. With the hose off coolant keeps streaming out of the thermostat housing. Not a lot but it does. I assume this is why I seem to have contiuous pressure in that top hose.

When I recently replaced that thermostat and seal I had noticed that the last seal had blown, probally exactly like this one has. Just for an opinion, do you think the therm. is not opening when it should?

Should I try the lower temp thermostat or just keep buying until I find one that works?

I'll try and make some time to test that themostat this week.