Re: OVERHEATING

Posted by HH56 On 2012/7/27 9:45:37

I had been looking at that same TS 6464 temp sender and noticed something on the Napa website which brought up a question. That same number is used on three applications which doesn't seem possible. On the applications for cooling fan and temp light they show these specs:

Temp Sender Switch Temp Rating : C At 100 Deg F w/ 23% Tol, O At 220 Deg F 13.5 Ohms w/ 9% Tol

On the same part number for gauge operation specs are:

Temp Sender Switch Temp Rating : 11.5-13.5 Ohms Resistance At 220 Deg F

I'm kind of having a hard time figuring out how the same sender can work 3 different items with completely different needs. One could assume the C and O on the first spec would be closed and open but unless there are strangely configured relays involved, doesn't seem plausible for both fan & light operation. To have a resistance range mixed in to what would seem to need a simple on/off function seems odd as well.

Out of curiosity, could you measure that sender. At cold, we would need 80-100 ohms minimum. More would probably be OK as long as ohms start falling fairly quickly once engine started to heat. At 180, we would probably want in the 25-35 range and at boiling or 220 the listed spec of around 10.