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The Volvo XC90 is a mid-size luxury crossover SUV manufactured by Volvo since 2002 and now is in its second generation.

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Xc90 2007 Heater is not working?

The heater on the XC90 2007 doesn't seem to generate heat why?

what could be the problem?

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Does the blower work? Is the heater core plugged? Does the door not move to heat? We need more info please



Yes blower works,

don't know if the core is blocked and it is a button to change to heat?


Heaters are usually supplied with engine coolant so there should be two medium sized heater core hoses from the engine to the firewall. Another two hoses would be the ac system in the same area. Heater hoses are larger and should feel hot with a fully warmed up engine. One hose is coolant output from the engine, the other is the return from the heater back to the cooling system, either to the coolant container or back to the engine. If blockage exists, the return hose may not feel as hot as the supply hose. The hvac system may be either electronically controlled or manual. Electronic climate control heads either work or not. Dialing or pressing the up/down button to increase/decrease heat tend to use a temperature door inside hvac box where heat and cold are mixed for interior comfort.

To summarize, plumbing would be the heater hoses and heater core with coolant flowing thru. The hvac controls may be either manual or electronic. The temperature door moves to increase/decrease heated air.


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The heater temp control is an NTC sensor behind a small grill (indicated by the arrow) in the Climate Control Panel

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Take a torch and check to see if it is clean or broken. If not clean use a can of air to blow it clean. It then responds much better. If it's broken then visit the Volvo forums where you'll find out what to replace it with. It's a fiddly but not difficult job.

Alternatively, open the bonnet and at the back of the engine under the windscreen there are two black rubber hoses going through the firewall in the centre of the car.

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Put your heater on full heat and start the engine to heat up the coolant. You should feel one getting hot and the other noticeably cooler as heat is pulled from the coolant into the cabin. If the temp difference is barely noticeable then it's quite possible the heater matrix is partially blocked. Frankly it's a common issue. Some people (inc me) have had great success by removing the hoses to the matrix and REVERSE flushing using mains water pressure. You'll be amazed at the junk that comes out.

So, connect the mains to the matrix RETURN (cooler pipe) and leave the matrix FLOW (hotter pipe) open or pipe it to a bucket where you can then be amazed at the gunk. Basically, connect it all up and CRIMP the flow into the matrix by getting someone to fold the hose in half. Turn on the tap full pelt. When you're ready, suddenly let the flow go to put full mains pressure through the matrix for a couple of seconds. Crimp it again and do it all again. What your doing is sending a series of pressure pulses through the matrix in order to dislodge junk.

It will not harm the matrix as the other end is open. If it's too blocked then little of nothing will come out and flow will not be good. If that is the case then it's a new matrix at around £35 and a few hours work.

Hope that helps.

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Fitted new heater core 2010model XC90 core not heating up

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Is your heater always flowing coolant or is there a shutoff valve operated manually or automatically by the hvac control head? Older heaters, in general may have a shutoff valve to stop coolant flow and may fail. If no shutoff valve, then a flush of the cooling system may be needed, including the two heater hoses to be sure of coolant flow. Heaters with coolant continually flowing thru the heater core use a damper door to regulate heat into the interior.


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