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Ask Mike Kelly Your Own Question
Mike Kelly
Mike Kelly, Auto Service Technician
Category: Car
Satisfied Customers: 5470
Experience:  17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.
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I have a l200 truck, the temp gauge stays at normal temp

Customer Question

I have a l200 truck, the temp gauge stays at normal temp mark, but the expansion tank is filling up to top .what do you think the problem is

Submitted: 2 years ago.
Category: Car
Expert:  Mike Kelly replied 2 years ago.
Hello, welcome. My name is***** will do my very best to assist you with your question. I apologize if you have been waiting long for a response.
When the expansion tank is filling up like this, this is normally a indication that there is exhaust gases entering the coolant system.
How this happens is there is a breech in the head or head gasket.
There needs to be a block test performed on the vehicle and this can be performed at most any shop.