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Discussion Starter · #1 ·
I've done a search through the threads here on the 164/168 and haven't found exactly what I want to address here.


A couple of things going on here. First my fan doesn't come on till my temp gage reads around 220 - 225. Mechanics have said that the gage is off by 20 degrees...when gage in cabin reads 220, a temp reading at the radiator (via laser temp gauge) reports back ~200 degrees. Ummmm, well I'd like to believe this is true, but then why when I'm running the car on the freeway in 80 degree weather at 70-75 mph, or on a main arterial @ 40-45 mph w/out stop n go traffic, the cabin gage is reading 195-200, which would seem like what the normal operating temperature should be. If the 20 degree thing is true, then the car, at normal highway or road speeds is running @ 175 degrees. Could that possibly be true??? For a while I had the fan jumpered to remain constantly on when the ignition is hot. Under those conditions the temp gage always read around the 195 mark, straight up @ noon.

Secondly, the thermo switch has been tested...I've had it out of the car and put in the pot of water, and found continuity on the pins around the 200 degree mark +/- 5-10 degrees. Radiator fluid is @ fresh 50/50 concentrate.

I removed the fan jumper, and had the system checked. I'm being told that it is running correctly, even though interior gage is showing 225 -235 in any stop and go situation. It is literally freaking me out! I pop the hood, and while it's hot in the engine bay, it doesn't appear to be extremely so. I don't hear the ping, ping of expanding/contracting metal. No evidence of steam or bubbling radiator fluid anywhere.

So I guess perhaps the physical measurements taken with the laser tool might hold true. At the same time I'd like to have my temp gage be more reflective of the actual temperature...seeing the gage go that high, really grabs my attention and makes me tense. I find it hard to snooze at the wheel, along with the rest of my fellow drivers on the road. Does anyone else have this discrepancy between actual and reported temps? I've also been told that the 24Vs, especially the 95's run hotter for better emissions.

I'd hate to install a manual fan switch for peace of mind, but baring some sort of sage advice here on the BB, that might be my only other choice.

PS The thermostat was changed out at 5K-7K ago, with the water pump when belts were done.

Thanks for any advice on this.
 

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Discussion Starter · #5 ·
Yes, my car has the OEM 3-wire sensor. When I went to test the pins, the water temp kinda shot past the low point to the high point, so I wasn't really able to test the low temp activation, but when the water was near boiling (with air bubbles forming on bottom of pan) I found continuity on all the prongs....which wasn't there at the lower temps. Car Disc chapter wasn't clear on what prongs are which so I was moving my multimeter around till I found continuity, and then tested the other lead and found it there too. I assumed all pins are activated at the high temp...couldn't catch the senor at the lower setting which is only like 8-12 degrees lower for activation I believe.

On the way home from work this a.m. I'll give the A/C a try. Living here in Seattle, turning the A/C on to troubleshoot something is like the farthest thing from our minds. Good thing I have a ready supply of flanel to don. May have to change out of the Birkenstocks and put the Doc Martins on....

Will let you know the results of that.....

Ciao for now,
 

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Discussion Starter · #9 · (Edited)
So I do have the fan come on when I activate the A/C. I like the idea of getting the ****pit gage in synch with the real temperature in the engine bay so I will seriously consider putting an inline resistor in the gage wiring. The cap on the overflow tank is good...it hold pressure.

Goats, how did you determin the 27 ohm value? Trial and error or ????

Down the line I will consider going the aluminum radiator route, along with the A/C condenser. First Jason, I need to get that combo for the Verde beast under construction with JJ. Mid August here, and the "hot" weather (everything is relative) is almost over for the moss&mildew crowd up here.
 
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