Cooling System Trouble Shooting (Page 3/3)
Vintage-Nut JUN 30, 08:57 AM
Hey Aaron - did you solve your problem?

Please don't let your thread hanging......
Aaron.Russell JUN 30, 11:33 AM

quote
Originally posted by Vintage-Nut:


Aaron,
Before the coolant gauge climbs into the red again, try this:

On a cold start, take hold on the rubber radiator input hose {driver side} and feel for the hose temperature increase {when the thermostat opens} which is 195-degrees.

Read your coolant gauge at this point; when my 195-degree thermostat opens, my coolant gauge reads 175-degrees.

*IF you don't feel the radiator input hose getting hotter, perhaps your thermostat is 'stuck' closed............
*IF your coolant gauge is really off from the 195-degree point, maybe start with the sensor: GM 25036809 / AC Delco 213-71 / Standard Ignition TS-168 (Aftermarket: Delphi TS10051)

Also, can you tell us if the coolant gauge will climb into the red WITH the fan ON?

EDIT:
Another subject, Replace the Factory Fan Switch {235-degree} with a lower temperature.
Many members brought Rodney's 210/200 degree switch to kick the fan on sooner.....
https://rodneydickman.com/p...o.php?products_id=88



I will try this when I can. Car won't start currently, I believe it is having spark issues again.

My current thoughts is that the gauge is just off. I like the idea of feeling the hose to figure out when the thermostat opens.

I have had both of the fan switches that Rodney offers with no luck, which further makes me think that it is the gauge.

Like I mentioned can't confirm now since the car won't start.
Vintage-Nut JUN 30, 02:02 PM
Thanks for responding Aaron


quote
I know the fan works / DOES turn on when I ground the fan switch / the temp gauge sending unit was replaced / I have had both of the fan switches that Rodney offers with no luck, which further makes me think that it is the gauge.



I agree with you as you replaced the temp gauge sending unit.

When you get the car running again, YES:
Read your coolant gauge immediately after when the thermostat opens and use this starting point on your coolant gauge....

If so as the coolant gauge IS really off, I bet your problem is in the instrument panel {a.k.a. POD}

Good luck on your spark problem.....you have another post coming?

EDIT - Read Ogre's Post:
Fuel, Engine Temp or Oil Pressure gauges have problems? by theogre
https://www.fiero.nl/forum/Forum2/HTML/146784.html

[This message has been edited by Vintage-Nut (edited 06-30-2024).]