Low coolant warn­ing

Car Mechanics (UK) - - Help! -

I have a 2004 Vaux­hall Zafira 2.0 and have just re­placed the coolant ex­pan­sion bot­tle, swap­ping the low coolant sen­sor in it with an orig­i­nal one. Now I have a mes­sage on the dash­board say­ing the coolant level is low, even though it is topped up. M Bad­cock

From your let­ter, I am as­sum­ing that this prob­lem has only oc­curred since the coolant ex­pan­sion tank was re­placed. If this is the case, a stick­ing float in the new ex­pan­sion tank or a poor con­nec­tion to the new sen­sor may be the most likely cause.

The low coolant sen­sor works in con­junc­tion with a float within the ex­pan­sion bot­tle. I would first check that the float is free to move within the ex­pan­sion tank and that it is sit­ting cor­rectly above the sen­sor. If there is no fault with the float or sen­sor, I would in­spect the con­di­tion of the wiring to the sen­sor, to en­sure that the prob­lem is not be­ing caused by a short­ing or bro­ken wire.

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