Coolant Temp Gauge Fluctuates After New Ect And Tstat
Posted 01 August 2012 - 04:50 PM
I recently did a bunch of maintenance/stage 0, which included PCV replacement, coolant flush, new genuine volvo ECT (coolant temp sensor), and new genuine volvo thermostat.
The car runs great, no leaks or anything. A couple hundred miles after I replaced everything the car threw a CEL for P0116. I cleared the code and it hasn't come back for a couple of weeks now.
I was driving her car the other day and while sitting in traffic with the AC on I noticed the coolant temp gauge was sagging.(pointing to around 4 o'clock). About 10 minutes later after traffic cleared up and I was driving at speed the gauge returned to its normal running temperature position.
My only ideas are a defective ECT sensor (seems odd since this one was a brand new blue box part) or possible a bad fan relay.
Any ideas/input would be appreciated.
'95 854 Yellow T5-R Manual - Built 2004 2.3L RN - garage queen (CarDomain)
'97 854 Black N/A Manual - daily beater
Posted 02 August 2012 - 03:30 AM
2000 Mercedes W210
1995 854 NA Auto
RIP - Dad - M.G.T 10/31/42 - 12/03/05 "Press On"
Posted 03 August 2012 - 03:46 AM
The reason I pulled them and studied them was some minor variation on the temp gauge similar to what you are observing. Between steady running and idle I would see small fluctuations in the needle.
Posted 03 August 2012 - 06:09 AM
if you hear the fan coming on and off as it should, doubt the relay is bad.....
Posted 03 August 2012 - 08:30 PM
B Mac: "It smells like dead rat again."
98 V70 AWD Manual: Wothrline ECU, angled 15G turbo, White injectors, EST Intake, R Manifold, TME Downpipe, TME Exhaust, IPD Swaybars + HD endlinks, Volvo Strut Brace, Öhlins Roadholding Suspension + Springs, 302mm Front Rotors and Vented R Rears, SS Brake lines, E-spec C70 Jewels.
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