Hi all, my first time here but I just wanted to post a reply to the original problem. My wife's car had the same issue, nissan quashqai that would only give lukewarm cabin air. I read this forum among others for advice and combined all the replies to fix the problem. For some context, she is Brazilian living in cold old Ireland so no heat in the car was a big issue.
Firstly some tech details. 11 model, 1.5 dci with air con rather than old style heating.
Engine has a priority routing of the coolant to the heater core, the little radiator in the dash that heats the cabin, this engine coolant heats up very fast but the actual main radiator temp. does not get hot for quite a while.
Having eliminated the coolant level as a issue I focused on the heater core. Found it to be blocked by disconnecting the two hoses at the bulkhead and putting two 19 mm hoses onto the ports. I put the garden hose onto the 19 mm hose and had very poor flow on the outlet, next tried compressed air in the reverse flow direction but no good. Finally I filled the core with a mild caustic solution and left for 20 mins and bingo, now she's complaining that it's too hot. I have no idea what was blocking it but it's working now. Hope this helps someone and keep up the posts. Many thanks to you all.
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