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Old 1 Week Ago   #1
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Heaters only warm

Hi all,

Only had my Grande Punto about 2 weeks (1.2 8v) but Iíve noticed the heaters donít get hot, there only warm, Iíve noticed when I drive the car without the heaters on the temp gauge will be in the middle, soon as I put the heaters on the gauge drops slightly,

The 2 heater matrix pipes are hot and the top rad hose going to the thermostat is also hot but the lower pipe is cold,

Iím I correct to say the top rad hose isnít suppose to be hot until the thermostat opens? Does this sound like the thermostat is slightly stuck open?
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Last edited by Liam1804; 1 Week Ago at 16:41.
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Old 1 Week Ago   #2
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Re: Heaters only warm

I would put money onto it being the thermostat...just dont buy a cheap one.
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Old 1 Week Ago   #3
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Re: Heaters only warm

On my old 1.4 8V I had a problem when I bought it with an airlock in the heater pipes, the water was flowing fine around the engine but not going into the heater.

I had to take off the heater pipes and flush them through with a garden hose twice to push the water into the pipes and push out the air.
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Old 1 Week Ago   #4
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Re: Heaters only warm

I brought a new thermostat today, itís a Vernet branded one from euro car parts,

How do you remove the heater matrixís pipes? Is there a certain way to remove the clamps?

I donít want to damage anything, Im replacing the clamps with spring clamps instead,

Iíve also brought some gasket seal, is it necessary to use it when doing the thermostat, itís already got a rubber gasket with the kit, just wondered if other owners used gasket seal just as extra measures
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Last edited by Liam1804; 1 Week Ago at 19:24.
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Old 1 Week Ago   #5
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Re: Heaters only warm

As soon as the flanges surfaces are clean and there are no previous seal debris, the rubber gasket should be enough, no need of any extra 'compound' !
But it's still recommended to check for leaks just after the job's done (engine at working temp), and check the coolant level for the next couple of weeks ...

BRs, Bernie
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Last edited by Bernievarian; 1 Week Ago at 20:38.
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Old 1 Week Ago   #6
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Re: Heaters only warm

Just a quick update, fitted the new thermostat today and heaters are now red hot,
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Old 1 Week Ago   #7
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Re: Heaters only warm

Good stuff. Well done
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Old 6 Days Ago   #8
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Re: Heaters only warm

Thanks for the update Liam, as Charlie said: job well done !

BRs, Bernie
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Old 6 Days Ago   #9
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Re: Heaters only warm

Is this normal? When the vehicles up to normal temp and I just let the car idle with the heaters on 2 the temp gauge drops to the next marker, not the big the small marker, first time owning a petrol,
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Old 6 Days Ago   #10
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Re: Heaters only warm

Quote Originally Posted by Liam1804 View Post
Is this normal? When the vehicles up to normal temp and I just let the car idle with the heaters on 2 the temp gauge drops to the next marker, not the big the small marker, first time owning a petrol,
As you've successfully changed your thermostat you obviously know what you're doing. But, for the edification of others lets think about how this works. The heater system allows coolant to circulate all the time which is what happens from the moment you start the engine. On the back end of the cylinder head is the thermostat (as you know) which will be closed when the engine is cold. When the engine heats the water circulating in the heater system to "working temperature" (that is the temperature the manufacturer wants the engine to run at) the thermostat will open and hot water will flow out to the radiator header tank, letting cool water flow from the bottom of the radiator into the engine. The engine coolant temperature will then drop so the thermostat will close and so the whole cycle goes on (in practice the thermostat spends it's life "floating" - more or less open depending on heat generated by the engine so that a more or less constant temperature is maintained - commonly around 90 degrees centigrade.) So if your thermostat is defective often it stays open too long and lets water circulate through the radiator too soon so the whole system runs cool.

For this to work properly the radiator has to be able to, under all operating circumstances, shed more heat than the engine can ever generate. It has to be realized that coolant circulates all the time through the heater matrix so it's cooling the engine too, but how much heat it can shed (in heating you inside the car) depends on how "hot" you set the heater control. So on a really cold day, when idling for lengthy periods with the heater fan on and your temperature control set to full hot it's quite conceivable that there might be sufficient cooling capacity in the heater matrix to satisfy the cooling needs of the engine on it's own. I've never owned a car where the heater matrix on it's own could actually exceed the cooling (at idle) requirements of the engine until now! Our Ibiza 1.0 3 cylinder TSI seems to be able to achieve this "trick". On very cold days when idling for prolonged periods (there's one particular set of traffic lights which invariably take about 3 or 4 "goes" to get through) If we have the heater on full hot with the fan on the temp gauge falls to about 85 degrees - from it's normal 90 - It never does it when driving or for short halts and she comes up to temp quickly from cold with the top hose staying cold until full heat is reached. Maybe yours is doing something similar?
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Old 6 Days Ago   #11
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Quote Originally Posted by Pugglt Auld Jock View Post
As you've successfully changed your thermostat you obviously know what you're doing. But, for the edification of others lets think about how this works. The heater system allows coolant to circulate all the time which is what happens from the moment you start the engine. On the back end of the cylinder head is the thermostat (as you know) which will be closed when the engine is cold. When the engine heats the water circulating in the heater system to "working temperature" (that is the temperature the manufacturer wants the engine to run at) the thermostat will open and hot water will flow out to the radiator header tank, letting cool water flow from the bottom of the radiator into the engine. The engine coolant temperature will then drop so the thermostat will close and so the whole cycle goes on (in practice the thermostat spends it's life "floating" - more or less open depending on heat generated by the engine so that a more or less constant temperature is maintained - commonly around 90 degrees centigrade.) So if your thermostat is defective often it stays open too long and lets water circulate through the radiator too soon so the whole system runs cool.

For this to work properly the radiator has to be able to, under all operating circumstances, shed more heat than the engine can ever generate. It has to be realized that coolant circulates all the time through the heater matrix so it's cooling the engine too, but how much heat it can shed (in heating you inside the car) depends on how "hot" you set the heater control. So on a really cold day, when idling for lengthy periods with the heater fan on and your temperature control set to full hot it's quite conceivable that there might be sufficient cooling capacity in the heater matrix to satisfy the cooling needs of the engine on it's own. I've never owned a car where the heater matrix on it's own could actually exceed the cooling (at idle) requirements of the engine until now! Our Ibiza 1.0 3 cylinder TSI seems to be able to achieve this "trick". On very cold days when idling for prolonged periods (there's one particular set of traffic lights which invariably take about 3 or 4 "goes" to get through) If we have the heater on full hot with the fan on the temp gauge falls to about 85 degrees - from it's normal 90 - It never does it when driving or for short halts and she comes up to temp quickly from cold with the top hose staying cold until full heat is reached. Maybe yours is doing something similar?

Top man, explained very well,

I noticed the top part of the radiator wasnít getting as hot as the lower part, so I decided to try and bleed the system again, I canít remove the bleed screw on the radiator because it isnít the same as in the guilde section, mine wasnít a spanner type. Itís a Philips screwdriver type one, but because of the location thereís no way to get a screwdriver in there,

What I did was hold the revs at 4K, I noticed the coolant rising and was almost over flowing then I saw a couple of airlocks come out and the level dropped, Now the top part of the radiator gets as hot as the lower part, There must of been trapped air still in the system, but it seems to be all good now 🤞
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Last edited by Liam1804; 6 Days Ago at 21:17.
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Old 7 Hours Ago   #12
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Re: Heaters only warm

Is it normal for the coolant hoses to become hard when the engine is at normal temp? This is with the expansion tank cap on,
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Last edited by Liam1804; 7 Hours Ago at 14:45.
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Old 6 Hours Ago   #13
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Re: Heaters only warm

Its a pressurised system so imho I would say yes.
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