Auxiliary Air Valve (Idle Speed): Service and Repair

AUXILIARY AIR VALVE

RENEW





CAUTION: This procedure MUST ONLY be carried out on a cold or cool engine.

Carefully remove pressure cap from remote header tank to release any cooling system residual pressure. Replace cap tightly.

Slacken the clips securing the air hoses to the auxiliary air valve and pull the hoses clear. (1).

Remove two screws and washers securing auxiliary air valve to coolant pipe, lift valve clear. (2).

Clean all traces of gasket from coolant pipe, taking care not to damage seating area.

Scribe a line on idle speed adjusting screws and note number of turns required to screw fully in. (3).

On refitting set idle speed adjustment screw of replacement valve to the number of turns open as noted previously.

Coal the new gasket with suitable non- hardening sealing compound locate the valve on the coolant pipe and secure using the two screws and washers. Fit and secure the hoses.

Reconnect the battery earth lead.

Check coolant level at remote header tank, if necessary top up.

Check, if necessary adjust idle speed.