 | Home > Puma (Tdci) > no heat from heater |
 
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| Jerry Member Since: 13 Nov 2015 Location: Cardiff Posts: 196  
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I am no expert but just check your coolant and oil use - I had a head gasket go on a Volvo XC70 and the failed heater was the first symptom along with excessive oil consumption. My temperature gauge never moved off centre …until the engine was destroyed!
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5th Dec 2022 10:14pm |
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| neon1991 Member Since: 26 Mar 2018 Location: Colchester Posts: 75  
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coolant is probably low.
Check for leaks if it's a sudden drop (around the cap is a good one) Mine used to burp it's coolant out the cap when the head gasket went |
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6th Dec 2022 11:11am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17361 
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This is a normal symptom in a TDCi if the coolant is a bit on the low side, usually preceded by wildly fluctuating temperatures from the heater, then becoming constant tepid.
The first step is to check the level and top up if necessary. If it is low, monitor the level to see how quickly you're losing coolant, and if necessary investigate further. |
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6th Dec 2022 11:22am |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 1997
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When investigating if you are low on coolant, in addition to the cap, which is known to fail ( do a search on here) have a look at the heater valve which does fail and slowly drip , again a search on here will provide details.
Also with a rag around the bleed screw to catch fluid loosen it to expel any air in the system. |
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6th Dec 2022 1:14pm |
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| Rosco Member Since: 03 Dec 2010 Location: Burntwood Posts: 1833 
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This has reminded me my heater output has reduced recently, and I even noticed whafts of heat when going round roundabouts.
Sure enough header tank pretty much empty  2007 - Stornoway Grey 90 XS SW - Gone
2002 - Black Discovery II - Gone 2014 - Montalcino Red 110 XS SW |
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6th Dec 2022 3:17pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8018  
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Coolant level low as above.
If it comes in blasts of cold then red hot then cold then it'd prob head gasket time. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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6th Dec 2022 4:14pm |
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| bcarlin Member Since: 24 Sep 2011 Location: lanarkshire Posts: 290 
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Update
Coolant level is fine with no loss of water, when traveling on the motorway the heat gets better but only really if you have it on 1. When you turn the dial to cold it does go cold and same with hot. I opened the bleed screw and no air appeared to be coming out. |
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6th Dec 2022 4:28pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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So coolant level is fine. Temp needle is where it is meant to be.
Do you have a OBD reader? or a laser thermometer you can get your hands on? You need to test the actual temperature of the coolant and engine. Eliminate that as the problem. Is there a flap that is not adjusted properly? letting too much cold air in? Could be the cable has popped off at the heater or knob end. Your heater control valve is cable operated as well. |
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6th Dec 2022 4:37pm |
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| bcarlin Member Since: 24 Sep 2011 Location: lanarkshire Posts: 290
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Hi
I don’t have a reader or thermostat. How many cables control the hot/cold side of the heater ? I thought it was only the one on the valve that controlled the hot/cold ? |
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6th Dec 2022 6:29pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Well they cost around a tenner and you will absolutely know whether it is your engine or something else that is faulty. You will also be able to see whether the pipes leading to the heater matrix are as hot as elsewhere or if your radiator is sapping all the heat.
https://www.amazon.co.uk/unknows-Thermomet...1&th=1 Good bit of kit to have when you need it. As for the cables. I am unfamiliar with the Puma heating system, however, there is a cable that goes to the heater control valve (plastic on bulkhead) and at least 1 if not two that go to the heater box itself. It might be that one or more of these are not fully opening or closing what they are meant to. This is a common thing on earlier Defenders, every now and again you have to re-adjust the wire within the lever fixing on the heater box to make sure the flap inside is actually closing properly. Have a poke around under the bonnet and make sure everything is working as it should be. |
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6th Dec 2022 7:26pm |
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| bcarlin Member Since: 24 Sep 2011 Location: lanarkshire Posts: 290
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What temp should the water be ?
And should I check at the expansion tank |
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6th Dec 2022 7:30pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Thermostat begins opening at 88degC. You may get a bit less if measuring the temp of a rubber hose, but you will be able to tell if it is in the 80s or only at 50...
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6th Dec 2022 7:39pm |
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| bcarlin Member Since: 24 Sep 2011 Location: lanarkshire Posts: 290
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If it’s low would that suggest the stat isn’t opening or what else could it be ?
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6th Dec 2022 7:49pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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If the coolant is struggling to get to temperature then it would suggest that your thermostat is opening early or stuck open. To test, get your engine to operating temps and point your thermometer at the radiator and then the hoses and engine block, if they are close to be the same then it is more likely that the thermostat is stuck open. With the thermostat closed there should be a temperature difference between it and the rest of the coolant system.
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6th Dec 2022 7:53pm |
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