# 04 Ford Fiesta - Overheating **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** fiesta, engines, ford\ **Created:** [January 2, 2023, 8:39pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269 "2023-01-02T20:39:36Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![dainabrolly\_183580](https://avatars.discourse-cdn.com/v4/letter/d/e9bcb4/32.png) [@dainabrolly\_183580](https://community.cartalk.com/u/dainabrolly_183580)\ **Post date:** [January 2, 2023, 8:39pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/1 "2023-01-02T20:39:36Z")
Hi there, looking for advice on what could be wrong with my car. Old car so trying to figure out if worth fixing it. 60k on the clock - EML on - Severe coolant loss (having to top up antifreeze every drive, internal leakage by the looks of things as no visible leaks) - No engine power loss - White vapor coming from right side of bonnet - Oil looks fine (recently serviced) - No smoke from exhaust as far as I can tell - Hissing from expansion tank, small cracks surrounding the cap ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [January 2, 2023, 9:12pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/2 "2023-01-02T21:12:46Z")
Remove the radiator cap when the engine cold. Start the engine, and as it idles watch the coolant in the radiator. If bubbles form in the coolant, he engine has a blown head gasket. [![](https://global.discourse-cdn.com/cartalk/original/3X/3/1/316cbd8f332345d355df088e66478a0676deb84c.jpeg "Radiator bubbles blown head gasket") ](https://www.youtube.com/watch?v=iV5z3k_dVaA) Tester ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [January 2, 2023, 9:16pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/3 "2023-01-02T21:16:11Z")
Symptoms point to a leaking head gasket. An expensive repair unless you do it yourself. There could be other internal damage to the engine as a consequence of coolant loss and overheating. The white vapor suggests some coolant steam is being expelled to the outside of the gasket. The hissing indicates engine compression getting into the cooling system’s plumbing - another indication of a head leak. Can you get a readout of what is causing the EML (AKA CEL, Check Engine Light, or MIL, Malfunction Indicator Light)? This does not always come on in case of a head gasket leak, but may give a clue as to what’s going on. ---
**Author:** ![dainabrolly\_183580](https://avatars.discourse-cdn.com/v4/letter/d/e9bcb4/32.png) [@dainabrolly\_183580](https://community.cartalk.com/u/dainabrolly_183580)\ **Post date:** [January 2, 2023, 9:45pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/5 "2023-01-02T21:45:16Z")
Just went and checked. There are no bubbles ---
**Author:** ![dainabrolly\_183580](https://avatars.discourse-cdn.com/v4/letter/d/e9bcb4/32.png) [@dainabrolly\_183580](https://community.cartalk.com/u/dainabrolly_183580)\ **Post date:** [January 2, 2023, 9:47pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/6 "2023-01-02T21:47:52Z")
What else causes substantial coolant leakage? Car has been plugged in and diagnostic says cylinder 3 misfire. Orange check engine light is on ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [January 2, 2023, 9:48pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/7 "2023-01-02T21:48:28Z")
Then you may have a bad thermostat that’s stuck closed. Tester ---
**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\ **Post date:** [January 2, 2023, 9:50pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/8 "2023-01-02T21:50:54Z")
> [@dainabrolly\_183580](#): > > Hissing from expansion tank, small cracks surrounding the cap needs to be addressed. if the system does not hold pressure the engine will overheat, and you will lose coolant. I am not familiar with your specific car, but you can be losing coolant through the overflow tube if it has one. ---
**Author:** ![dainabrolly\_183580](https://avatars.discourse-cdn.com/v4/letter/d/e9bcb4/32.png) [@dainabrolly\_183580](https://community.cartalk.com/u/dainabrolly_183580)\ **Post date:** [January 2, 2023, 10:05pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/9 "2023-01-02T22:05:06Z")
Will a pressure test confirm this? If the thermostat is stuck closed, then where is all the coolant going? ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [January 2, 2023, 10:16pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/10 "2023-01-02T22:16:27Z")
No.A pressure test won’t reveal if the thermostat is stuck closed. Remove the the thermostat and boil it water to see if it opens, [![](https://global.discourse-cdn.com/cartalk/original/3X/4/4/4470eefabf1ebc74cecce65968802ff988f5b8ff.jpeg "How to Test a Thermostat | Thermostat Test Boiling Water") ](https://www.youtube.com/watch?v=RDacej0nEGU) Tester ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [January 2, 2023, 10:26pm UTC](https://community.cartalk.com/t/04-ford-fiesta-overheating/188269/11 "2023-01-02T22:26:43Z")
Cylinder 3 misfire is a clue to the location of the head gasket leak.