Re[2]: {Chrysler 300} Re: Temperature Sender
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Re[2]: {Chrysler 300} Re: Temperature Sender



Exactly what I had to do on my J years ago for the temp, although I needed 12 ohms in series to get the gauge reading right at "normal" 180 degree engine temp.  See here:
Temp gauge fix (chrysler300club.com)
Seems that 63-64 temp gauge reads really high with the aftermarket senders.  I tried two different gauges = same result. 
even with NOS stock sender sometimes - Jamie with his K at Omaha - temp gauge nearly on "H" yet the engine temp was normal for the 85 degree driving conditions - about 190 degrees at the stat per my IR thermometer.   ALWAYS use the IR - DON'T trust the gauge until you know how it reads with the installed sender.  Shoot IR above open stat or at sender. 

I find my 61-62 temp gauges don't read quite as high with the aftermarket senders, but still higher than original.  Use lower ohm resistor like John says.
Fuel gauges WAY off on 60-62 with new senders, I just fill up when it gets between 1/4 and 1/2 for peace of mind.  Still usually has 10 gal left. 
Don't want to replicate Noel at Omaha!

Temp and fuel senders on my 57 still factory original = perfect.  Thermal temp gauge on 57 designed for 160 stat (no A/C) so 180 will read a little higher.

Carl


------ Original Message ------
From "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
To "Kevin deGraauw" <kdegraauw@xxxxxxxxxxx>
Cc "James Douglas" <jdd@xxxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Date 9/20/2024 6:47:37 AM
Subject Re: {Chrysler 300} Re: Temperature Sender

have some brand new info just yesterday on this ( not the two terminal switch but the thermal gauge issue ) 
It seems all the aftermarket  “ new” senders are not calibrated right , both temp and gas tank . Way it is ,they sell you anything  that will   screw in on temp . The 57-58 ( 59?) are a completely   different design and on those i gave up — aways get one from a 57-56 junkyard motor ( plym dodge etc work) And they fail a lot . 
But at end of day knowing  ohms volts etc does not fix a gauge that reads wrong , !! 
— on gas gauge make SURE  float goes top to bottom of tank which may require extending the arm , shaping etc so the float travel hits the end stops on sensor at EXACT  same time float hits top snd bottom  . Key to success.  Note that correct  ohms etc is useless if travel is wrong 

But back to temp while trying to make  gas gauge reasonable , 3 rd pull of tank before realizing travel was not enough on “ fits your car” sender . 
I changed to electronic VR . It apparently puts  out slightly more average heat than stock pulsing so both gauges then read high  , can live with that on fuel ( goes above F)  i want empty  region  right .  

Note you cant really measure pulsing net heat 

But this caused temp which always ran at lower end of bar to run  at high end of bar . Don't like that .

So to cut to it , i bought a  25 ohm 15 watt potentiometer  put it in series with temp sender , with engine at normal  dialed in gauge to left end of gauge bar  (perfect ) despite the three variables one is fighting . We dont  care too much why — just want it right at normal temp . 
Magic number is 5.5 ohms , get 2 watt resistor near that ,add in at sender  = peace 

On Sep 19, 2024, at 10:36 PM, Kevin deGraauw <kdegraauw@xxxxxxxxxxx> wrote:


I do have the book and so I should have the OEM part number. Trying to see what crosses over in an aftermarket world. Problem is no one has one available of course, but I'll keep looking... thanks for the reference to download!
Kevin

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From: James Douglas <jdd@xxxxxxxxxx>
Sent: Thursday, September 19, 2024 8:32:41 PM
To: Kevin deGraauw <kdegraauw@xxxxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: RE: Temperature Sender
 

Go to https://mymopar.com/

 

Download the 1965 Master Parts Book and look up the part number…

 

James

 

From: Kevin deGraauw <kdegraauw@xxxxxxxxxxx>
Sent: Thursday, September 19, 2024 17:06
To: James Douglas <jdd@xxxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: Temperature Sender

 

Hey so along that same line, on my 300L, it has that "COLD" and "HOT" idiot light setup in lieu of a gauge. 

 

My sender was a little crusty, so I put a new one in- now, for some reason, the "COLD" won't light up any more. I put the old one back in and it does come on.

 

 I think I may have a situation where there were later model dummy "hot only" lights in big block taxies or something that the parts houses are crossing over to this year incorrectly. 

 

Any idea what part number sender makes both of these lights function? The old crusty one and the replacement one both have 2 terminals and they both have the same letters on the terminals and are arranged the same, so it plugs right up as well. 

 

Kinda weird yes ,but I do like the green light on a cold morning.

 

Thanks!

 

Kevin

 

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From: 'James Douglas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Sent: Thursday, September 19, 2024 4:00:22 PM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx>
Subject: {Chrysler 300} Temperature Sender

 

I picked up a MOPAR NOS temperature sender for my 300K today. In a bag with a factory part label on it.

 

I rigged up my fluke tester as well as my calibrated kitchen thermometers and tested it. This is what I recorded:

 

At 64 degrees Fahrenheit, tap water temperature, I recorded 300 Ohms.

 

At 180 degrees Fahrenheit in a pot I recorded 36 Ohms.

 

It wanted to float a little on each end as the fluke is VERY sensitive. I would say no more then one or two ohms if that.

 

It will be a bit before I can place it in the car as the A/C compressor must come up to get it in. That a PITA this is to change, and one then has to dig out the tools to reset the belt tension and torque all the bolts including the power steering pump as that lower bolt has to come out as well to get the A/C up in the air.

 

Once done, I will see where the gauge on the dash falls when cold and at running temp.

 

James

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