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Discussion Starter #1
Afternoon All,

I attempted to replace the thermostat in my 2 litre hdi today, but I'm stuck. I cant get one of the hoses off (the bottom one at the back) and I also cant get the temp sensor plug out (i cant even see it).

I'm going to try to resume tomorrow, any one got any tips on how to get those last 2 bits off to I can actually change this thing.

Even better, I don't suppose anyone is in Brighton & can come & lend me a hand on this last leg?
 

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Discussion Starter #2
ok, so i managed to get it off & fit a new one this morning, but i think i have anther issue.

I used the coke bottle header-tank to refill the system, & i dont get any air from the bleed points. But now almost as soon as i start it, the cooling fan kicks in (way before the thermostat even opens) the pipes at the top & bottom of the rad both get equally warm, but the rad itself stays pretty much stone cold. The engine temp gets up to about 90C (should it get that hot?) with the fan thundering away (it doesnt cut in & out, just stays on).

Any suggestions?
 

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big airlock in the rad?
bottom hose should be appreciably cooler if the rad is working/top hose too hot to touch..?
try pumping the hoses(to move the air) with your hands squeezing them..?
neil
 

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Another way to clear airlocks....

I had a diesel escort a few years back which was mainly used by my ex girlfriend who constantly complained about the heater not being very good. I spent a whole weekend messing around with it and after running out of ideas, I filled the header tank to overflowing, replaced the cap and drove it in 2nd gear with throttle to the floor for a few miles. As if by magic the heater was fixed and the water level had gone down considerably. It must of had an air lock somewhere. Refilled the header tank to correct level and it was fine from then on.
 

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Discussion Starter #5
Hi Neil,

That was my first thought. The top hose is a little warmer than the bottom, but niether is too hot to touch. I've tried pumping them, with no success.

Bloody annoying that i replaced the thermostat as it was stuck open making the car run cold, now its running hot.
 

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Discussion Starter #6
& i was going to drive like that for the first bit of my commute tomorrow Richard...we'll see what happens
 

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Discussion Starter #7
when i do the thrashing, should i leave the cap off so the air can escape, or will all of my coolant escape instead?
 

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I would have the cap on and fill the header until it's overflowing.

You don't want the water level to drop so as more air gets in the system!

Check the water level afterwards.

Your not really looking for the air to escape, but just to force it round the system so it ends up in the top of the header tank where it belongs.
 
C

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Hi Neil,

That was my first thought. The top hose is a little warmer than the bottom, but niether is too hot to touch. I've tried pumping them, with no success.

Bloody annoying that i replaced the thermostat as it was stuck open making the car run cold, now its running hot.
Did you put the new thermostat in the correct way round? ie not upside down?
 

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Discussion Starter #11
a/c is off, and the new thermostat went in the correct was around (i put in an entire housing,& it looked pretty impossible to put it in the wrong way)
 

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Regarding air-locks.. I never had any problems with my 2.0 HDi.

It is supposed to be enough just to fill it up and do a quick bleed on the heater matrix hose if I don't remember wrong.

The small hoses going to the header tank shall fix most of it automaticly once it's heated up and thermostat opens.

Just fill after with fluid. Never had an issue and I've been out with engine and completely empty of coolant several times.

Why did you change the thermostat in the first place, any problems with engine?
 

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Discussion Starter #14
I changed the thermostat as the old one was stuck open. No problems with the engine otherwise. I'm hoping I didnt do anything wrong fitting the new one, & like i said, it was a complete housing i fitted, so i'm pretty sure i couldnt have put it on the wrong way, & the hoses didnt have enough reach in them to connect to the wrong bits.

We'll see what the garage says tomorrow, though it bloody well better not be a faulty thermostat.
 

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a new stat faulty...Mm not unheard of theses days sadly quality control being what it is these days.....ie NOT,
i have to say i normally drill a small bleed hole in wether they are there normal or not as it helps it bleed /burp the system when fitted new( 1/8th or smaller is enough..)
- the old stats had a little tadpole/ jiggle pin of course that sealed itself after self bleeding....progress eh !:nono:
neil
 

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If it was running cold before, all you have done is change the stat and now running hot, then it has to either be faulty stat or airlock. Unless something else has happened during the stat changing process!
 

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any news ....i'm sure we're all on the edge of our seats awaiting the next installment...lol:D
good news i hope(and a cheap job):thumb:
neil
 

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Discussion Starter #18
all done. just cost me an hours labour. They got a little bit of air out of it, and now it runs nicely. they also comented that i'd done the thermostat right, which was good to hear.

Now i've just got to get the last niggling bits fixed which have been broken since i got it (scrubbing wheel arch liner, glow plugs, and my passengers seat [electric] clicks as i drive along) & i'll be 100% happy

Anyone have any ideas about that passenger seat? it drives me nuts.
 
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