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Over heating, heater matrix?


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Ok, so I've been out in her twice now and the temp gauge is reading after about 20 minutes 110 and even creeping up. So I pull her back into my drive and check the cooling pipes, the top rad pipe (which goes to the temp gauge on the block) is roasting hot and the bottom pipe is cool, can easily put my hand on it. So I turn the engine off and all of a sudden the bottom pipe gets really hot, I take once the engine is off the coolant flows back into the expansion tank? Could it be that the heater matrix is blocked (air lock) I think that needs investigation? Also I've just taken the pipe off of the block, the one that goes to the heater matrix and that was empty, no coolant, shouldn't that be full? And I have an overflow pipe at the front off the rad, that just seems to pour coolant constantly, that can't be right?

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Ok its a more modern car but we had something very similar on a mk4 golf recently and the tstat was the cause.  At least you can chuck the lotus one in a pan of water and boil it up  to see if its working.

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Bloody'ell that was hard work, 2 hours to get the sod off, that bloody little bolt behind the pully, I couldn't tell you how I managed it, but got the barstuward off! So the waterpump is off but the good news is that it looks in perfect condition and very little end play in the bearing, so we can rule that out. It must be filling the system correctly, must be doing something wrong. I have found in the manual the correct procedure to refill so I'll give it another go. The thermostat also looks tip top so and to be honest the coolant come out clean, still blue, and no sludge I could see. Has to be an air lock?

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Before you start to nail that all back together, source an allen headed bolt to replace the one which sits behind the pulley. It saves so much time for future fiddling.

As for the thermostat, you can't tell solely from a visual inspection whether they are any good or not. Yes, you can do the dunk test in a jug of hot water, but given their low cost it's usually more decisive to just replace them with a known correct part.

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I agree on the thermostat, only problem is, the housing is practically welded to the waterpump. I've tried to get them off but they are bending my 5mm allen keys! Good idea the allen bolt behind the pully, that is a sod to get off.

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Have a look at this, see what you think? It's that top small hose just next to the otter switch, that seems to constantly 'overflow'?

 

http://i89.photobucket.com/albums/k223/altabani/Mobile%20Uploads/20140929_082928_zpsab540a80.jpg

Edited by Advantage
A quick tidy of the photos.
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That pipe is intended to help the system bleed itself if air. You will have lost quite a bit of water running that disconnected and not had the system pressurise so thus could be the cause if all your overheating issues

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Perfect, thanks. When you take apart a car there is so much to think about when you actually start putting it all back together and you can easily overlook the simple issues. I've ordered some new hose (just because I want new hose), hopefully this will now resolve this overheating and I can start driving the car. Cheers Wilf, much appreciated  :thumbsup:

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