hot when idle, cold when moving

Anadinolin · Aug 14th, 2013, 10:56

the car has been running a little cold while on the motorway - the needle floats about 1/3 the way up while on the move, while it idles the needle shoots up to 3/4 of the way up before the fan kicks in.

Hmm, i think it could be thermostat, but i only changed that a little while ago at 49k Miles when i changed the H/G I put in a new water pump then too approx 3 months ago.

the car has de-ionised water in it at the moment, and the old oil from HG change - the car is now on approx 55k

there are a likely few culprits -

1) new waterpump = more efficient cooling?

2) thermostat has stuck open?

3) vapour lock? - i massage the pipes to help any air escape into the expansion tank.

4) somethings not quite right with my ignition?

5) wants an oil change?

what do you think guys?

edit: bllox was half asleep when i wrote this, mean it to be in the general 400 section if the mods can move please

doingitsideways · Aug 14th, 2013, 13:27

Sounds like the stat to me mate

When you changed it did you use a 92° or 89°c one?

If you used an 89°c, it may be opening too early and over cooling the engine.

Must admit though, my B18u was the same as you describe!

Steve

Anadinolin · Aug 14th, 2013, 13:34

not sure if it is an 89 one, just went up to the counter, asked for a trolley load of bits lol.

iv ordered a new one from GSF car parts, will check it to see if its a winter or summer one.

mate suggets it could be the new water pump, being extreemly efficient, and the needle might level back out after a few months use....hmm

Aug 14th, 2013, 10:56	#1
Anadinolin VOC Member Last Online: Jun 20th, 2022 14:32 Join Date: Oct 2009 Location: Upminster View Photos By: Anadinolin	hot when idle, cold when moving the car has been running a little cold while on the motorway - the needle floats about 1/3 the way up while on the move, while it idles the needle shoots up to 3/4 of the way up before the fan kicks in. Hmm, i think it could be thermostat, but i only changed that a little while ago at 49k Miles when i changed the H/G I put in a new water pump then too approx 3 months ago. the car has de-ionised water in it at the moment, and the old oil from HG change - the car is now on approx 55k there are a likely few culprits - 1) new waterpump = more efficient cooling? 2) thermostat has stuck open? 3) vapour lock? - i massage the pipes to help any air escape into the expansion tank. 4) somethings not quite right with my ignition? 5) wants an oil change? what do you think guys? edit: bllox was half asleep when i wrote this, mean it to be in the general 400 section if the mods can move please __________________ what good music deserves is full deep bass to give it warmth. the stock volvo sub works....just at high volumes Drum n Bass and dubstep Last edited by Anadinolin; Aug 14th, 2013 at 11:59.

Aug 14th, 2013, 13:27	#2
doingitsideways The Daddy Last Online: Feb 29th, 2024 15:07 Join Date: May 2010 Location: Manchester	Sounds like the stat to me mate When you changed it did you use a 92° or 89°c one? If you used an 89°c, it may be opening too early and over cooling the engine. Must admit though, my B18u was the same as you describe! Steve __________________ XC90 V8 Exec, C70 2.4T Convertible, S70 T5 CD, 850 TDI, 2 x Escort vans and a 2.8i Capri. Clearout has begun, but must continue!

Aug 14th, 2013, 13:34	#3
Anadinolin VOC Member Last Online: Jun 20th, 2022 14:32 Join Date: Oct 2009 Location: Upminster View Photos By: Anadinolin	not sure if it is an 89 one, just went up to the counter, asked for a trolley load of bits lol. iv ordered a new one from GSF car parts, will check it to see if its a winter or summer one. mate suggets it could be the new water pump, being extreemly efficient, and the needle might level back out after a few months use....hmm __________________ what good music deserves is full deep bass to give it warmth. the stock volvo sub works....just at high volumes Drum n Bass and dubstep

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