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Anyone Know What This Is ?

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Can anyone help identify an engine (1G FE) component for me please ?

It is obviously some form of one way valve or bleed control but I’m not sure exactly what it serves ? If you can’t make it out on the photo the engraving on top of the plastic threaded head is ‘H’ (for hot / hydraulic ?)

It also has an observation window but again I can’t make out why you need this.

It’s located just to the right of the grill close behind the front off side headlight.

Pic below. Ta.

Click Here for Photo

Edited by ifraz

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Yeah I thought it might be for when they recharge the air con - add refrigrant / whatever.

Never seen one before though - even on cars with air con and also what is the 'H' for ?

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Hmmm, looks like the top up for the air/con, under the cap should be a valve ( looks like a tyre valve ) and the glass part to the right is the "inspection glass ", this is used to see if the air/con fluid level is low.

With the air/con turned on, that inspection glass should be clear ,if it has bubbles in it , it needs recharging :D

Bob.

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Never seen one before though - even on cars with air con and also what is the 'H' for ?

The "H" is for the High Point of the system, further back into the engine bay, you'll also see another cap simuliar to the front one but with "L" on the cap - Low Point of the system, allows for better bleeding of the system during recharging.

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H indicates high pressure side

L indicates low pressure side

As has already been stated the sight glass is used to check for bubbles in the system or low refigerant.

You will find these on all Toyotas with AC.

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