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  #1  
Old 19th January 2011, 03:50 PM
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Default Boiling up

Hi guys, I ran my engine up to temperature today, to ensure the temp guage is working and to recharge the battery.

After 20 mins of idling, the expansion tank boiled up and water flowed from the overflow. However the radiator remained cold, along with the bottom hose. The top hose feels empty.

I'm suspecting a stuck thermostat? Any other ideas?
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Old 19th January 2011, 04:19 PM
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yep... would say stuck stat as well... take it out and chuck it in some boiling water cool it under tap ....watch it to see if it opens(in hot water) and closes (cold tap) repeat several times to 'break' it back in, then check opening temp by gradually heating in water.
if fubar'd buy a new one ....they are only coppers
oh forgot to ask....your water pump is working isn' it ?

Last edited by K4KEV : 19th January 2011 at 04:23 PM.
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Old 19th January 2011, 04:39 PM
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Haven't checked water pump yet, but will do.

I'll definitely be pulling the stat out and checking to see if it's working or not. Just priced a new one, £52 inc VAT from my local motor factor! Was quite a funny phone call actually, they needed a registration number to identify the exact model of BMW I had so i gave them the one of the donor. The line went very quiet for a while so i asked if I'd got the number right, and explained i wasn't sure as I'd broken the car a couple of years ago.

With a huge sigh of relief, the lady on the other end says "I'm so glad you told me that, I didn't have the heart to tell you your car had been scrapped!"

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Old 19th January 2011, 04:45 PM
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before you know it ....they will know the last time you farted or squeezed a zit
52 notes.....never thought I'd here me say I'm off to the local scrappy for a stat
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Old 19th January 2011, 07:36 PM
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Quote:
Originally Posted by K4KEV View Post
before you know it ....they will know the last time you farted or squeezed a zit
52 notes.....never thought I'd here me say I'm off to the local scrappy for a stat
You wana see the price of one for a 24V Ford Scorpio.

TT
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Old 19th January 2011, 08:03 PM
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Quote:
Originally Posted by twinturbo View Post
You wana see the price of one for a 24V Ford Scorpio.

TT
Go on TT I do love having a good Harrrumph, how much?
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Old 19th January 2011, 08:05 PM
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Quote:
Originally Posted by Talonmotorsport View Post
If turns out not to be the stat you may have an air lock.
Hmm, might try that first actually. As I'm guessing it might be easier.

I'll take the rad top hose off and make sure it's filled with water then try again.
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Old 19th January 2011, 08:15 PM
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Quote:
Originally Posted by aerosam View Post
Go on TT I do love having a good Harrrumph, how much?

Think they were £85 last time I looked! and a water pump was about £140.

Annoying thing is that a Granada 24V ( which is almost identical engine wise ) would use a £7 stat and £20 pump.

Thankfully I no longer have a Scorpio 24V engine.



I too would suspect the stat on your engine or the pump. Did 2 stats and a pump on friends cars last year Due to rapid overheating.

TT
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Old 20th January 2011, 02:57 PM
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Wow, that be one 'spensive stat.

I'm afraid to say I'm not having much success with this. This morning I disconnected the rad top hose, which was empty, and filled it before quickly reconnecting it. Ran the engine, and after 10-15 mins the expansion bottle was overflowing again. This time I'm sure there was no air in the rad or it's hoses, until it started boiling, when the bubbles found their way into the top hose.

Ok so what's the next step?

I'm thinking disconnect the top hose again, refill and start up for a few seconds with it disconnected to check the pump is working. If it is, remove the thermostat and check it's operation.

What do you guys reckon to running without the stat at all? The rad is only half the size of the donor's, and as it's only going to be used on track it's going to be generating a lot of heat. The extra cooling might be benefecial.
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Old 20th January 2011, 03:47 PM
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You won't get a "flow" unless the stat is open or removed....I would defo check the stat because your symptoms are classic "stuck stat"
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