Field Monitor Unit - 98 4Runner
Oct 8, 2009 | 11:40 AM
#21
Rockslide:
Actually, mounting the the T sensor in free stream won't give a colder reading than ambient. It will read ambient. Heat may be lost more quickly in fast air, but the temperature of the sensor will bottom out at ambient unless it is wet (then you'll get evapourative undercooling) or it is in sun (radiant heating giving a higher reading).
Actually, mounting the the T sensor in free stream won't give a colder reading than ambient. It will read ambient. Heat may be lost more quickly in fast air, but the temperature of the sensor will bottom out at ambient unless it is wet (then you'll get evapourative undercooling) or it is in sun (radiant heating giving a higher reading).
Forgive my ignorance as I posted that informaton 2yrs ago....when I was young and dumb
. I have since learned how these sensors operate.
Dec 20, 2009 | 12:09 PM
#23
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Joined: Dec 2004
Posts: 86
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Just remember, try not to mount this temp sensor in a spot that gets hit with direct air flow from the outside. For example, if you drive on the freeway at a high rate of speed and it's already cold outside, the temp sensor will be hit with a constant strong force of air. Thus causing the temp readings to state it's colder outside than it really is. This air will be much colder than the air if around your vehicle if you were parked.
Dec 20, 2009 | 12:51 PM
#24
Exactly. Read my response a couple posts up...
Last edited by Rock Slide; Dec 20, 2009 at 12:54 PM.
Dec 20, 2009 | 12:54 PM
#25
If you mount them where the factory mounts them which is just below the left head light on the front metal radiator support sheet metal it will not be in any direct air flow no mater how hot or cold it is outside so you will get a more true reading. Here is how I did it quote from above.
"Update: Installed the temp sensor behind the left front bumper below the head light. Was super easy. Removed the canister that is located in the left front fender well exposing prime location for the Temp Sensor. Used existing hole to to act as the alignment tab for the sensor. Marked a hole location and drilled it out. Placed sensor on the front side of the fender well, bolt, lockwasher, nut and then wired the plug with the sensor wires I routed through the firewall and zip tied to the existing lighting wire run."
"Update: Installed the temp sensor behind the left front bumper below the head light. Was super easy. Removed the canister that is located in the left front fender well exposing prime location for the Temp Sensor. Used existing hole to to act as the alignment tab for the sensor. Marked a hole location and drilled it out. Placed sensor on the front side of the fender well, bolt, lockwasher, nut and then wired the plug with the sensor wires I routed through the firewall and zip tied to the existing lighting wire run."
Jan 4, 2013 | 10:51 AM
#26
Registered User
Joined: Aug 2011
Posts: 291
Likes: 0
From: Dallas, TX
If you mount them where the factory mounts them, which is just below the left headlight on the front metal radiator support sheet metal, then it will not be in any direct air flow, no matter how hot or cold it is outside, so you will get a more true reading. Here is how I did it - quote from above:
"Update: Installed the temp sensor behind the left front bumper below the headlight. Was super easy. Removed the canister that is located in the left front fender well, exposing prime location for the Temp Sensor. Used existing hole to to act as the alignment tab for the sensor. Marked a hole location and drilled it out. Placed sensor on the front side of the fender well, bolt, lock washer, nut, and then wired the plug with the sensor wires I routed through the firewall and zip tied to the existing lighting wire run."
"Update: Installed the temp sensor behind the left front bumper below the headlight. Was super easy. Removed the canister that is located in the left front fender well, exposing prime location for the Temp Sensor. Used existing hole to to act as the alignment tab for the sensor. Marked a hole location and drilled it out. Placed sensor on the front side of the fender well, bolt, lock washer, nut, and then wired the plug with the sensor wires I routed through the firewall and zip tied to the existing lighting wire run."
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