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Discussion summary
YOUR RESEARCHCoolant Warning Light Flashing. No temp reading advice pls
Reported or suspected cause
wiring or sensor
Suggestion or failed attempt
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
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Suspected cause
The sudden jump back to normal reading would make me suspect wiring or sensor.
Coolant Warning Light Flashing. No temp reading advice pls
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Leading evidence: 'wiring or sensor' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'wiring or sensor' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check coolant level' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Coolant Warning Light Flashing. No temp reading advice pls
Check coolant level (coolant level in the header tank)
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
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1
Discussions
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Suggestion
check coolant level (coolant level in the header tank)
Coolant Warning Light Flashing. No temp reading advice pls
Check deck lid fan
Suggestion or failed attempt
No successful repair reported for this finding.
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Discussions
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Suggestion
Problem is in engine compartment temp circuit .;; check deck lid fan for obstruction and proper operation.
Coolant Warning Light Flashing. No temp reading advice pls
Check first
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
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Discussions
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Coolant Warning Light Flashing. No temp reading advice pls
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5 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
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Hello all,
Have read some of the previous posts on this, but not sure I've seen the same symptoms described as I'm experiencing.
Start the car from cold this morning, the coolant light is flashing and the display reads 'Failure........'
Drive slowly to work, light still flashing and no temp reading whatsoever.
After about 10 minutes, the temp reading jumps straight to the normal operating window in the middle of the dial and the light stops flashing.
Any thoughts on what I should check first...?
Thanks.
1. check coolant level (coolant level in the header tank)
2. engine the compartment cooling fan (underside of lid), light flashes if this fails
3. Check rads for any leaks
4. possible sensor issue ?
___________________
from the internet
For those with a " slow flash" warning (one per second) , it can be caused by several things.
1. low coolant switch ; if the coolant is low by only a few ounces, the slow flash may come on intermittently at times.
2. engine compartment temp:: if the engine compartment temp gets above 185F, the slow flash will activate. If the temp sensor (located in intake manifold between #5-6 runner in rubber grommet) is dislocated and fell on top of engine it will slow flash, of if the engine lid fan is inop.
3 UAOS Sensor :: If equipped with UAOS, the slow flash will activate if the accumulation reaches 120CC .( drain accumulator, unless you have the high-mileage/Extreme Track Duty Auto Drain).
When diagnosing the "slow flash" always start with the obvious.
Level 1 diagnosis ;;
a.Check the coolant level,
b.check the temp sensor mounting,
c. drain the accumulator (if UAOS equipped NOTE:: not necessary you have the high-mileage/Extreme Track Duty Auto Drain)
Level 2 diagnosis
a. disconnect the low coolant switch at the bottom of reservoir and leave unplugged and road test. Results: if slow flash stays off , problem is in the low coolant switch, if slow flash remains, continue to (b).
b. Leave low coolant switch disconnected, and disconnect UAOS harness and leave dissconnected . result: if slow flash stays off , problem is in the UAOS harness/sensor, if slow flash remains, continue to (c).
c. Problem is in engine compartment temp circuit .;; check deck lid fan for obstruction and proper operation.
Level 3 diagnosis; this requires wiring diagrams, a DVOM, a good skill level and understanding of Automotive systems.
a, test low coolant circuit
b.test engine compartment temp circuit
c. test UAOS sensor./harness
Low coolant level would explain the slow flash stopping as the car warms up (and the coolant expands), but I would expect the gauge to continue to read coolant temp through the warm up cycle.
The sudden jump back to normal reading would make me suspect wiring or sensor. Does anyone know what the gauge reports when the coolant temp sensor is unplugged? It's possible that the sensor is not immersed in coolant, but if coolant were that low I'd not expect expansion to be enough to recover the level signal and temp signal at the same time.
I topped up the coolant - even though it looked fairly full. Flashing light has gone away for now, so will see if it stays that way.
Thanks for replies.
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