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Temp gauge reads hot with thermostat and runs at 210 w/o thermostat
- Thread starter CTRacing
- Start date
- Location
- Minneapolis, MN
The gauge on the dash is not a calibrated scientific instrument, it's just a dash gauge. The difference between about 200* and about 210* is about 5%, which is within reasonable expectations for a dash gauge. Is your IR temp gun calibrated or certified ?
The Coolant Temperature Sensor can be tested, or for about $25 you can replace it.
The Coolant Temperature Sensor can be tested, or for about $25 you can replace it.
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
You don't state your year, but there could be two sensors. Also, it depends on where you are checking the temp.
O-Gauge Steamer
NAXJA Forum User
- Location
- Colorado Springs, Colorado
Also, if you checked it at the T-Stat housing, there is a lossdue to the aluminium radiating the heat off. The housing tends to be slightly cooler than the probe.
- Location
- Minneapolis, MN
Cheap crappy OEM style parts from IdiotZone/Advance/O'Reilly's, or genuine Jeep parts ?
Is you IR gun calibrated and certified ?
Is you IR gun calibrated and certified ?
O-Gauge Steamer
NAXJA Forum User
- Location
- Colorado Springs, Colorado
DO not waste your hard earned bucks on Sensors from BozoZone or, for that matter, other "cost effective" parts sources. Go to either NAPA or better still, the Dealership. By the time you actually find a working sensor from the cheap outfits, you have more than paid full list price from the Dealer.
I have a friend, here in the Springs, that purchased an Oil Pressure Sender for his 97 from the local O'Really?. He instantly had wonderful oil pressure. Idled, hot at better than 40psig. Ran up to near 70psig when driving. I suggested that the part they sold him is an incorrect one... He has since replaced, with a Dealer sourced part, it and the gauge reads where it should.
FYI on the Dash Gauges. In the case of my 98, the PCM and the Dash both agree with an IR thermometer. One of the things I verified when chasing my "ultimate cooling system" was the "is the Jeep accurate" question. At least on mine, it is.
How very strange. Mostly, factory dashes are "For Reference Only" in nature.
I have a friend, here in the Springs, that purchased an Oil Pressure Sender for his 97 from the local O'Really?. He instantly had wonderful oil pressure. Idled, hot at better than 40psig. Ran up to near 70psig when driving. I suggested that the part they sold him is an incorrect one... He has since replaced, with a Dealer sourced part, it and the gauge reads where it should.
FYI on the Dash Gauges. In the case of my 98, the PCM and the Dash both agree with an IR thermometer. One of the things I verified when chasing my "ultimate cooling system" was the "is the Jeep accurate" question. At least on mine, it is.
How very strange. Mostly, factory dashes are "For Reference Only" in nature.
hubs97xj
NAXJA Forum User
- Location
- Fort Wayne, IN
The 97+ dash gauge is driven by the PCM, so the PCM and gauge will always agree.
I will agree with the advice to buy anything but cheap parts store sensors/senders. I'm 1 for 3 on aftermarket sensors in the last 2 years...
O-Gauge Steamer
NAXJA Forum User
- Location
- Colorado Springs, Colorado
^^ Yes, the PCM and the dash should agree as there is only one sensor and the PCM sends the data to the cluster to display. Does not mean the factory sensor is accurate which is why I verified the actual temperature with the IR gun. Not surprisingly, there are temperature differences across the head. If you will, hot spots. Nothing drastic and once the engine has had time to soak, most of them average out.
It is my opinion that if you are going to chase a problem, you need to verify the data set with which you are working. Saves time in the long run.
It is my opinion that if you are going to chase a problem, you need to verify the data set with which you are working. Saves time in the long run.
- Location
- Minneapolis, MN
Buy NAPA or genuine Jeep, especially for sensors.
Cheap crappy "lifetime warranty" parts are cheap for a reason.
Cheap crappy "lifetime warranty" parts are cheap for a reason.