ihscoutlover
NAXJA Forum User
- Location
- Edwardsville
I Have a '94 XJ with about 50k on the stock 4.0 engine, 210k on the rest of the Jeep, the other day, my temp guage started running cooler than it has been. Replaced the T-stat about 8k ago with a fail-safe unit, and have check engine codes as follows:
12, 17, 22, and the end code 55.
17 states engine running too cool-fix: check T-stat for proper operation, check coolant sensor and circuit, Replace sensor.
12 is a battery disconnect which is from when I changed the headlight switch about 2 weeks ago.
22 states Coolant Temperature sensor or circuit-fix: check coolant temperature sensor circuit, check sensor resistance, Replace sensor.
I pulled the wire off the temp sensor on the T-stat housing and the electric fan kicked on. I don't know how to test the temp guage sender at the rear of the head on the engine, but I would need to know how to test the guage and or temp guage sender for resistance or voltage-whichever it reads, so I can figger out what the heck is going on. My Haynes book wants to lean towards the T-stat, I would think so, but surely after a 20 mile drive on the Interstate at over 65mph, the water temp should get high enough to make the guage rise right? If the T-stat was stuck open, know it would take some time for the engine to warm up, but why not eventually would the guage read a normal temp? So here is the delema, do I change the T-stat, or do I test all and see what is messed up? All the wiring is in great shape, no corrosion or damage of any kind. All the hoses feel hot like they should, but am I missing something? What kind of T-stat should I be using? Thoughts or suggestions??
Jeff
12, 17, 22, and the end code 55.
17 states engine running too cool-fix: check T-stat for proper operation, check coolant sensor and circuit, Replace sensor.
12 is a battery disconnect which is from when I changed the headlight switch about 2 weeks ago.
22 states Coolant Temperature sensor or circuit-fix: check coolant temperature sensor circuit, check sensor resistance, Replace sensor.
I pulled the wire off the temp sensor on the T-stat housing and the electric fan kicked on. I don't know how to test the temp guage sender at the rear of the head on the engine, but I would need to know how to test the guage and or temp guage sender for resistance or voltage-whichever it reads, so I can figger out what the heck is going on. My Haynes book wants to lean towards the T-stat, I would think so, but surely after a 20 mile drive on the Interstate at over 65mph, the water temp should get high enough to make the guage rise right? If the T-stat was stuck open, know it would take some time for the engine to warm up, but why not eventually would the guage read a normal temp? So here is the delema, do I change the T-stat, or do I test all and see what is messed up? All the wiring is in great shape, no corrosion or damage of any kind. All the hoses feel hot like they should, but am I missing something? What kind of T-stat should I be using? Thoughts or suggestions??
Jeff