Skip to main content ↑ ↓
Topic: Air sensor (Read 785 times) previous topic - next topic
0 Members and 1 Guest are viewing this topic.

Air sensor

Yahoo Message Number: 91953
Well, I am getting conflicting information regarding my (apparently) failed air temperature sensor. As I mentioned, I checked my fan controller connector, pin C to pin D, engine cool, and got 780 ohms. Pin E to pin F measures infinite (open circuit). One person says this will result in fan controller defaulting to high speed, another person says it won't. Which is right? How do I replace the faulty air temperature sensor?

Al Colby

2000 Intrigue 10979

Re: Air sensor

Reply #1 –
Yahoo Message Number: 91954
Al I sent you the trouble shooting chart in another email.
If you have a sensor that is showing infinite(open) it could very well be the cause of the fan running at full speed. The sensors are designed to send a signal that closes the valve when cool - slowing or stopping the fluid flow to the fan motor and as the sensor gets warm it sends the signal to open the valve allowing fluid to flow to the fan motor. In normal operation if you were to unplug either the 2 pin power plug or the 6 pin sensor control plug, this removes the sensors from the system(opens the circuit) and allows the fan to run at full speed to prevent engine overheat. Hope this helps.

Thank you
John Davis
JDRV INC.

Your RV / Marine parts and service professionals
JOHN DAVIS RV SERVICES INC. jd@... 541-306-6473 541-693-3015
Authorized parts and service for
HWH, Roadmaster, Zip Dee, Dometic, Norcold Kingdome/King controls,

NOTICE: This message is ONLY for the use of the individual or entity to which it is addressed, and it may contain information that is privileged or confidential. Do not copy or distribute this communication or disseminate its information unless you have been granted specific written authority to do so by the sender. If you have received this communication in error, please notify us immediately by telephone and delete the email from your computer system. Thank you.

Re: Air sensor

Reply #2 –
Yahoo Message Number: 91955
Al,

Some years back I put up a graph in the files section titled "RV Temp Sensor Graph.pdf".
From this you can determine what the temp sensors' resistance should be, if you know its approximate temperature.
A reading of 780 ohms indicates a sensor temperature well above 100 degrees F.

Dave

2000 Allure #30444
 

Re: Air sensor

Reply #3 –
Yahoo Message Number: 91956
Al, not to beat this to death but if one disconnects the cables from the controller it will default the fan to HIGH speed, i.e. and OPEN condition, that would suggest to me that your reading of an OPEN condition will do the same. Your least expensive root to fix this is to replace the air sensor, as I have mentioned before this is very easy to replace yourself and it is also very easy to check for the resistance across the sensor, it should be between 1.2k and 3k, assuming your wires are not broken and you already know that you have an open circuit then there is a high probability that the sensor is the culprit. The OPEN condition will cause the fan to default to HIGH speed.

Ray 2000 Intrigue 11040