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Virtual Wrench
Virtual Wrench, Ford Mechanic
Category: Ford
Satisfied Customers: 14618
Experience:  35 years Master Mechanic
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Expansion tank cap blew off ford fiesta

Customer Question

Expansion tank cap blew off ford fiesta
Submitted: 1 year ago.
Category: Ford
Expert:  Virtual Wrench replied 1 year ago.

Hello,

Have you been having trouble with the engine getting hot before this happened?

Customer: replied 1 year ago.
It do not show on gauge it just shot up all of a sudden
Expert:  Virtual Wrench replied 1 year ago.

Thanks,

I bet it has a small coolant leak(antifreeze) and over time it lost enough to make the engine run hot and thats why it blew the cap off.

How much coolant did you have to add to the tank after replacing the cap?

Customer: replied 1 year ago.
About a ltr of water could it be a air lock
Expert:  Virtual Wrench replied 1 year ago.

Thanks,

It might be an air lock but it would have had to loose coolant first.

Is the gauge showing normal now?

Customer: replied 1 year ago.
AA put a test on expansion tank with pressure cap got it up to temp 105 had to drive one mile and put new cap on next day this happen 4 days later again
Expert:  Virtual Wrench replied 1 year ago.

Ok, that really helps me. Thanks.

Take it in and have the engine thermostat replaced. On these cars they tend to get corrosion built up on the t-stat and it will stick closed and cause too much pressure in the system. Its not an expensive repair at all and will take care of the problem!

LJ

Customer: replied 1 year ago.
Aa check thermostat he had it on a computer and it showed when it opened up and also waited until fan kicked in
Expert:  Virtual Wrench replied 1 year ago.

Thats the whole problem though. When it gets a build up on the t-stat it will stick only sometimes and then work fine the rest of the time. I have seen this happen thousands of times over the last 36 years i have been doing this :-)

Bot***** *****ne is if you have the cooling system pressure tested for leaks and none are found, then i guarantee you the t-stat is sticking intermittently.

Customer: replied 1 year ago.
I will try thanks
Expert:  Virtual Wrench replied 1 year ago.

Please do. I feel real confident it needs replaced.

Take care.

I hope that i have provided the information you were seeking. If you are satisfied with my service please use the required rating for me to receive credit for working with you.

Expert:  Virtual Wrench replied 1 year ago.

I hope that i have provided the information you were seeking. If you are satisfied with my service please use the required rating for me to receive credit for working with you.

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