 | Home > Puma (Tdci) > Overheating in 6th gear going uphill (SOLVED) |
 
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| Kevlar Member Since: 28 Oct 2020 Location: Prague Posts: 78   
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I'm currently solving the exact same issue, over heating on the highway in 6th gear and pressure in the cooling system.
I bought a RELD test kit like this: https://www.amazon.co.uk/RELD-Cylinder-Com...ljaz10cnVl It confirmed that I had exhaust gasses in my coolant, more than likely meaning my head gasket was leaking. I'm now in the process of rebuilding the top half of the engine, nearly finished and I HOPE that it solves the problem. (800 GBP just in parts) I will update here once I know for sure |
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6th Nov 2020 7:45am |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323 
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Thanks for all the replies so far!
@kevlar I did the same thing and bought that kit and it came back clean with no gas escaping. I’m now considering changing the rad and thermostat. If someone could tell me how hot the rad should get - ie if the whole thing should be hot or just a small part of it say after a 20 min drive I would appreciate it. |
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6th Nov 2020 8:51am |
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| Kevlar Member Since: 28 Oct 2020 Location: Prague Posts: 78
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I changed my thermostat, viscous fan and flushed the radiator when I first noticed this issue. It didn't help.
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6th Nov 2020 10:19am |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
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I might try a rad flush. Anything to try and narrow it down before replacing any other parts.
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6th Nov 2020 11:41am |
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| Kevlar Member Since: 28 Oct 2020 Location: Prague Posts: 78
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On mine I also found that 2 of the injectors were totally gunked up with burnt black oil.
I expect in my case the over heating issue was stemming from the engine running poorly not the cooling system. I will see once I get it running again. Please let me know what you find or what happens after you flush the rad. |
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6th Nov 2020 12:07pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
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So today I’ve been fishing around the engine and thought I’d wipe oil residue off pipes and see if I could see anything out of place...and I found something!
 Click image to enlarge This has traces of coolant around the clip and I found the smallest drip on where it screws on but could only see it when you lean down. I put a tissue behind it and it came back with coolant so could this be the problem? I don’t even know what this is but it seems any leak is coming from the rear right hand outlet. * sorry for the sideways picture. Not sure why it did that! |
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8th Nov 2020 4:48pm |
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| DarrenJ Member Since: 07 May 2012 Location: North Beds Posts: 312 
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The radiator should be hot at one end and cool at the other, the purpose of the rad is to remove heat from the incoming water and output cool water to the engine so I’d suggest the radiator is ok.
I think the poi true you’re showing is the valve for the heater assembly - someone else will be able to confirm. Does the fault only ever exist in 6th gear? Ie does the overheating still occur if you’re in 5th and put your foot down when at a low rpm, ie engine under heavy load. Cheers Darren Darren |
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8th Nov 2020 5:20pm |
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| shropshiredefender Member Since: 05 Jun 2017 Location: Shropshire Posts: 832  
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Heater valve - random internet pic
A minor radiator leak caused my CHT sensor to cut in a few years ago, as I understand it - small leak = loss of coolant pressure = higher running temperature.  Just because you're offended doesn't mean you're right. |
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8th Nov 2020 5:28pm |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1728  
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Thats the heater valve with the drip - mines done it on and off for 10 years with no other issues, doesn't even need topping up between services!
beaten to it! Theres a bleed screw on one of the hoses on the top of the engine, unscrew it until fluid flows with no bubbles - with the heater in the cab on 'max' IIRC there are posts on here about water pumps internally failing, vanes falling off etc - not sure which engine though, hopefully someone on here will clarify that one. Theres an egr cooler on there back of the engine that can fail / leak or internally leak mixing exhaust with coolant or potentially dropping the coolant and pointing to / giving symptoms of a head gasket. failure when its fine. HTH Keith Last edited by ickle on 8th Nov 2020 5:39pm. Edited 1 time in total |
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8th Nov 2020 5:38pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
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Thanks for that!
Its only ever happens in 6th! I've tried to make it happen in other gears but it just does't do it. I've never had an issue with the heat in the car but I'll replace that anyway as clearly there shouldn't be coolant coming from it. If the heater valve was faulty, could that really have an impact the temp of the engine? * Just re-read shropshiredefenders reply so that answers the above!  Last edited by Greyman110 on 8th Nov 2020 5:44pm. Edited 1 time in total |
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8th Nov 2020 5:38pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
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I'll try the heater thing.
I had the EGR cooler replaced this year. |
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8th Nov 2020 5:40pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 323
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UPDATE
Checked the engine first thing and there was coolant on the heater valve. Bled the system just to make sure all the air was out. Did this with the engine and heater on. Did a drive with the heater on and there was quite a difference in the engine temps. Around town it was mostly mid 80's. On the motorway it was mid 90's and it didn't cut the fuel off when I went up hill during an overtake! Highest it got to was 110. With the heater off and switched to cold, the temp went up to 100 on slower roads but it seemed it went up and down very quickly where as with heater on the temps were more stable and went up and down slower. There's certainly something going on here so I've ordered a new heater control valve which I'll fit this week and then I'll report back |
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9th Nov 2020 11:09am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16879 
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IIRC from when I looked at the cooling system some time ago, the flow through the heater valve is critical to the engine cooling, and the valve either bypasses the heater, or allows both bypass and flow through the heater. If the bypass passage in the heater valve was obstructed, then shutting off the heater will certainly affect engine cooling, possibly critically.
This does however assume that my memory is correct.... |
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9th Nov 2020 12:56pm |
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| shropshiredefender Member Since: 05 Jun 2017 Location: Shropshire Posts: 832
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When I had the CHT sensor cutting power due to a small coolant leak a while ago I discovered -
It operates at 120 deg. It cuts the aircon off (it resets after a number of run cycles). It turns the electric (aircon)fan on. Hope some of that helps Just because you're offended doesn't mean you're right. |
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9th Nov 2020 8:25pm |
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