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I would like to now what can cause the temp gauge to jump up…

Customer Question
I would like to...

I would like to now what can cause the temp gauge to jump up and down?

Mechanic's Assistant: What is the complete model and serial number of your machine?

The driver was driving and the temp was normal , and suddenly it peaked and came down. UD(###) ###-####Model

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

I bough the truck second hand , received it only yesterday night from the dealer. They told us the enjin was overhauled and no problems at all.

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

None

Submitted: 7 months ago.Category: Medium and Heavy Trucks
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Answered in 5 minutes by:
12/14/2017
Technician: Wayne, Journeyman replied 7 months ago
Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 11,218
Experience: worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
Verified

Hi I'm Wayne

I will be assisting you with this issue today

the most likely cause is the coolant temp sensor

or a head gasket leaking if it pegs hot,

then drops to cold this is not uncommon for an engine overhaul

head not torqued properly

I hope this helps you

Wayne

My goal is to give you the best experience possible! I hope I have earned a 5-star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

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Customer reply replied 7 months ago
Thanks Wayne , if the head gasket blown , what signs will confirm that the gasket is damaged?
Technician: Wayne, Journeyman replied 7 months ago

Hi

Thank you for the response

he would see milky sludge in the radiator

on the radiator cap and also the engine oil dipstick

Wayne

Please remember to rate my answer so I get the credit for the question

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Technician: Wayne, Journeyman replied 7 months ago

Morning

Just following up with you

Did my answer help you ??

Wayne

Ask Your Own Medium and Heavy Trucks Question
Technician: Wayne, Journeyman replied 7 months ago

Morning

I took the time to answer your question

Please take the time to respond to me

Wayne

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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