🌫 Haynes’ World: What’s Behind Steamy Windows?

From: Haynes - Tuesday Jun 06,2023 11:30 am

Haynes' World is a regular feature that takes a look at what the staff at Haynes are doing with their vehicles. This time, poor heater performance has reminded Martynn that his Lexus's pollen filter is overdue a change!

Car: Lexus RX400h hybrid
Owner: Martynn Randall

Most of us have been pretty lucky with the weather lately, but a few months back, when it was cold and wet, the Lexus’s windscreen was taking longer to demist. The RX is my wife’s car and I don’t drive it very often. I kept thinking that I needed to look at it, but I never seemed to get around to it.

That changed when I had to drive it on a daily basis, and got really fed up with the slow demisting. I’d also come to the conclusion that the heater wasn’t up to scratch. Then it dawned on me that I hadn't actually looked at the pollen filter since we bought the car… in 2017!

Removing the old filter is very straightforward: open the fascia glovebox, remove the securing pins and fully open the glovebox lid.

The filter is fitted into a plastic frame that is slotted into the air distribution housing inlet. Simply squeeze the retaining clips together and slide the frame rearwards.

The filter (shown below right) was in a state, with lots of debris, dead insects and leaves clogging the airflow. Considering that Lexus recommends the filter is changed every 12 months, replacement was the only answer.

Two types of filter are available: a carbon-impregnated filter and a normal paper one. There's quite a difference in price, and because neither my wife or I suffer from allergies, I bought the cheaper one (above left).

Fitting the new filter and reassembling the glovebox took about five minutes, and the results are impressive. The screen demists much, much quicker and the heater is almost too powerful now!

For the sake of £10, it’s well worth changing your pollen/cabin filter once a year – and a Haynes Manual/AutoFix (the one for my RX is below) shows you how to do it.

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