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Rough idle with various coolant temperature
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cheekyage

Posted: Mon Feb 10, 2014 5:21 am

Joined: Jan 22, 2013
Posts: 94
Trade Rating: 0
Location: Australia

Hi all,

Today I noticed a bit of a rough idle and the coolant temperature gauge moving slightly above halfway then going back just under...then back up, then down.

I noticed the coolant gauge would only move up during idle or while the car is stationary. Once driving the coolant temp would go back down to just on halfway.

The weather temperature was 25 degrees Celsius and the car has been driven for about 10 minutes prior. Major service completed less than 3 months ago.

Any ideas on what is going on?

Lecktorious

Posted: Mon Feb 10, 2014 7:15 am

Joined: Feb 07, 2010
Posts: 3666
Trade Rating: +59
Location: Scotland

cheekyage wrote:

Think about it. You are sitting stationary in 25 degree heat. There is no air hitting the radiator, so the coolant temperature rises until the cooling fans kick in and bring it back down. This is why the temperature is fluctuating.


	'98 Nile Blue 306 GTi 6 '04 Obsidian Black 206 GTi 138

Edward

Posted: Mon Feb 10, 2014 7:33 am

Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage

A Peugeot 206 cooling fan that works? No way!


	2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible.

cheekyage

Posted: Mon Feb 10, 2014 8:21 pm

Joined: Jan 22, 2013
Posts: 94
Trade Rating: 0
Location: Australia

Apologies for sounding so noob. Even with a higher weather tempreture of over 25 degrees I've never noticed the gauge moving. But it does make complete sense as you mentioned Lecktorious.

kandlbarrett

Posted: Tue Feb 11, 2014 6:47 am

Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon

Yes, temp gauge movingh sounds normal. i do not think the two things are related. Clear fault codes; take it for a drive until you get a repeat of the rough idles and re-check fault codes.


	Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm) Why isn't my daughter an Alfaholic?

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