 | Home > Td5 > Overheating woes. |
 
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5416  
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Is it hot. Or is it reading hot. Pop the bonnet and you should know by smell and touch if things are really as hot as it’s indicating. Use an inferred thermometer would be a big help. Also a nanocom or similar will give you reading on engine temp.
Assume you got a good earth to engine. |
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20th Mar 2023 6:48pm |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63  
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I think its getting hot alright, thought I got a bit of a smell alright but can't be sure.
I think swapping the temp senders and getting identical needle position on the gauge confirms it for me. I'm not near anyone with nanocom. I'm just amazed it's not building pressure in coolant tank. Plenty of power and starting first pick of the key too. I got onto local engine overhaul specialists for a price on an AMC cylinder head just in case, it's either all in or move on as is, don't really want to do that because I'll just get crap offers. I have th old engine that had big end bearing trouble, can't really trust the cylinder head on that. |
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20th Mar 2023 6:59pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5416
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You say “lately” so for a while the temp was all normal on the new fitted engine?
It could be the pump not working, failed impeller, so it is not circulating the coolant. |
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20th Mar 2023 9:09pm |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63
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Yeah it seemed to take forever to warm up when I got it going with replacement engine.
I hadn't driven a Td5 previously so I wasn't sure. Had a 200Tdi and can't remember what it was like. I'll try a pump in it tomorrow if I can get one. |
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20th Mar 2023 11:24pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5416
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What’s the in cab heater like?
I would think that would be less efficient if water pump weak. Known ok rad? |
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21st Mar 2023 8:09am |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63
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Cab heater is perfect.
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21st Mar 2023 9:22am |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63
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I've ordered a waterproof, I'm going to try that and strip the head off the old engine and have it tested.
If I do end up removing the head I'm tempted to fit an AMC head, I just want the thing to be reliable. |
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21st Mar 2023 12:42pm |
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| jimbo55 Member Since: 15 Jul 2020 Location: Midlands Posts: 385 
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Are you losing any coolant?
The pressure caps are not uncommon to fail, the drive to the water pump also are pretty common. Heater matrix are prone to leaking, and the expansion tanks are also known to crack. I would check to see if you are actually getting any flow from the water pump? Crack one of the heater matrix hoses and see if you get any flow through it. |
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21st Mar 2023 3:33pm |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 790  
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I had the expansion tank crack where the cap pipe meets the round reservoir. The crack was hard to spot but it would not build pressure, was not overheating but loosing coolant through evaporation. These tanks are cheap so I just replaced and all was good again.
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21st Mar 2023 3:45pm |
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| miker Member Since: 13 Sep 2015 Location: Surrey Posts: 1758 
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And make sure the
 is bled properly. I've refilled my coolant in the past and thought all was fine for a few hundred miles till it burped an air bubble out from somewhere that then sat in the top hose, right next to the temp sensor. |
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21st Mar 2023 5:07pm |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63
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Thanks lads, I'll be sure to check everything that's been mentioned!
I'm waiting for a break in the weather to fit the water pump. I've taken the head off the old engine, I'll get it tested so I know I'll have a good spare. |
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21st Mar 2023 5:34pm |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63
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New water pump fitted, still the same.
Ran with expansion cap off for 20 mins, no change in water level, no visible bubbles in expansion bottle. Took it for a drive and within 5-10 mins gauge was up at 3/4. Stopped and opened expansion bottle, some coolant overflowed under pressure but I think that would be expected? It wasn't boiling over or anything like that. Going to try and get engine temp confirmed with nanocom tomorrow. Has anyone got any guide to testing coolant temp sender and gauge? I've taken head off old engine, I'll get it tested to have as a good spare hopefully. |
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28th Mar 2023 9:16pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 572  
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Just for info - Nanocom uses the same sensor for temperature measurement as is used by engine ECU for its work and for indication na dash. So with Nanocom you can only check the function of tempereature indicator on dash, not the the real temperature measurement. Better is to use some non-contact (infrared) thermometer and measure temperature of cold engine, to get some starting point for emisivity calibration and than check the hot and hotter engine temperature. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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29th Mar 2023 7:07am |
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| murph81 Member Since: 11 Sep 2022 Location: Ireland Posts: 63
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Hi Tom, I hadn't thought of that.
I'll grab a laser thermometer in work tomorrow and test it. I think I will be taking the head off, it can't be much else at this stage. |
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29th Mar 2023 5:42pm |
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