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> UNDERheating problem, World-of-the-strange
dante giacosa
post 28th February 2019 18:19
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Hmm,

Well; I've just completed my bi-monthly 300-mile commute to the top of the country, and was surprised to discover an anomaly on the way.

My coolant gauge- which; once up to temperature ('90') NEVER moves- was reading low. Just over 70 in fact, at motorway speeds.
Very strange. Ambient temperature; 8 degrees.

Stopping at roadworks; the temperature steadily rose to a nominal indicated 90, before the radiator fan came on...

As I was sitting at the roadworks; I could see the needle on the temperature gauge making MICRO-movements up and down, but steadily rising.

(I also have oil-temperature instrumentation; and this read an ordinary '100'- which confirmed the engine was okay. There was no loss of power, no sign of a coolant leak, or anything.)

My thoughts are: thermostat, or coolant-temperature sender?

The car does run quite rich I think.

Thoughts?




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dante giacosa
post 28th February 2019 21:16
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Hmm,

Started the car again, after an hour and a half off, and immediately drove for twenty minutes.

The coolant-gauge was reading 'stone cold' all the way- showing no temperature at all.

The oil-temp gauge came up as expected, and I was able to blow proper hot air from the vents.

Got to my destination, left the car running for a few minutes and the coolant-gauge came up to temp...


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SteveG
post 28th February 2019 22:12
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QUOTE(dante giacosa @ 28th February 2019 21:16) *
Hmm,

Started the car again, after an hour and a half off, and immediately drove for twenty minutes.

The coolant-gauge was reading 'stone cold' all the way- showing no temperature at all.

The oil-temp gauge came up as expected, and I was able to blow proper hot air from the vents.

Got to my destination, left the car running for a few minutes and the coolant-gauge came up to temp...

Sounds more like sensor to me, too erratic for the stat.
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hazeyblue
post 1st March 2019 08:48
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I'd start with the Temp Sender Unit.
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JeremyG
post 1st March 2019 09:07
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QUOTE(hazeyblue @ 1st March 2019 08:48) *
I'd start with the Temp Sender Unit.


Yes, i'd agree.

Dante - first half of your first post (low temp at motorway speeds rising when stationary) suggests thermostat but everything else suggests temp sender (or wiring).

I guess you could have both...
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dante giacosa
post 1st March 2019 11:50
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Ok team-

Thanks for your feedback.

Got an appointment for next week at my specialist.

We'll have to see...


A quick sniff at the back of the coolant-sender doesn't reveal much



This post has been edited by dante giacosa: 1st March 2019 12:17
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Ganz
post 2nd March 2019 22:28
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That's never happened on mine. I'd be guessing so see what the specialist says. Sure it's nothing serious. Water temp was one of the reasons I brought the extra gauge with its own sender. 145/6s and water temps eh?

This post has been edited by Ganz: 2nd March 2019 22:28


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dante giacosa
post 3rd March 2019 10:31
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that's interesting Ganz-

Yes- it was somewhat a relief to have additional instrumentation; I'd have been quite worried if I hadn't been able to independently confirm genuine engine temperature.

Interestingly- I've driven the car a couple of times over the weekend; and it's sat at high-idle after starting for a long time- almost as if the engine isn't receiving the signals to make a descison to adjust the ICV down.

It's running fine though.
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dante giacosa
post 7th March 2019 09:47
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the 146.gif is in with my marque-specialist today for the coolant temperature issue.

This morning; I had warm air within three minutes of driving, but now a completely dead coolant-indication gauge all the way there...

Hopefully this should make it quite an easy diagnosis.
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