Your thoughts and experience would be appreciated:
Car interior is not getting up to and maintaining its temperature. On "auto" setting the fan does not seem to be blowing as it did previously, but it blow when the manual settings for footwell, mid level etc. are used. Although the warmth of the air coming through seems cooler than before. Defrost mode seems to work normally.
The car has just come back from an inspection 1 service and new primary drive belt, pulleys and tensioner being fitted. All was perfect with the climate control before the garage visit.
The radiator has been removed/refitted and all of the filters have been changed including the cabin/pollen filter.
The car was half a litre short of coolant after 700 miles and five days. The dealer took the car back, topped up the coolant and pressure tested the system agin. Saying the computer does not show any fault with the blower.
I am wondering if there is likely to be an airlock blocking the heater matrix, or a pipe dislodged in the process of changing the cabin filter.
Thanks for reading my overly long post.

Last edited by Webbie on 4th Feb 2017 11:49pm. Edited 1 time in total

Additional info: fans workday normally from cold start to this morning, blowing warm air. When the car reached normal oporating temp on the gage, the fan stopped blowing and air went cool. Side windows started to mist up.

Please edit thread title from "hearer" to "heater"

Does sound like you have an airlock somewhere, can be tricky to bleed all the air out. Also possible faulty/intermittent FSR ?

Changing pollen filter unlikely to dislodge any pipes. .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999

Thanks Jo 90. Heading amended. What is the FSR?

Final Stage (Blower) Resistor

http://metricrat.co.uk/tag/fsr/ .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

Previous: L322 Range Rover TDV8 3.6 2008; L322 Range Rover TD6 3.0 2002; P38A Range Rover V8 1999