How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Ross Your Own Question

Ross, Diagnostic and repair technician
Category: Car
Satisfied Customers: 1159
Experience:  Licensed diagnostic and repair technician
Type Your Car Question Here...
Ross is online now

My ford mondeo ran low on coolant today and dial showed it

Customer Question

My ford mondeo ran low on coolant today and dial showed it overheated but no warning light came on now fan is running for few minutes after i switch engine off after topping up coolant
Submitted: 1 year ago.
Category: Car
Expert:  Ross replied 1 year ago.
Hi my name is***** am a diagnostic technician and look forward to working with you.There are a few possibilities as to what has happened, Firstly before we look into the problem at hand the fact the coolant was low in the first place is a concern. Were there any obvious leaks? and roughly how much coolant did it require to get it back to the maximum. Thanks. Ross.
Customer: replied 1 year ago.

It wasnt completly empty it took about just under a litre i could still see coolant in resevoir bur it was low havent noticed ant leake.

Customer: replied 1 year ago.

It keeps on overheating now and loosing power

Expert:  Ross replied 1 year ago.
Many thanks, Sorry for all of the questions, Does your model have a key lock in the rear hatch as well as operating on central locking? This is often mechanical problem with the links for the release.
Expert:  Ross replied 1 year ago.
Sorry, that wasn't for you.Ok, it's not a huge amount by any means, I suspect the low coolant may be due to the engine running hot and releasing steam, this is normal under these conditions.Clearly the fan is running, which is a good sign, Ideally now the car needs to be left to cool if not already and started and left to idle, the temp gauge will gradually rise to the normal position, at this point the thermostat beings to open to bleed coolant to the radiator and the fan will cycle on and off as necessary.There are a few possibilities as to what may have gone wrong, the most common is simply a sticking thermostat. When the car is left running and reaches the normal half way point, turn the interior cabin heater on full HOT. See if this keeps the temp gauge in a normal position, If it does I suspect the thermostat is faultyIf not, either the water pump, radiator or temp sensor could be at fault, but the thermostat should be ruled out first.Please follow these steps below and report back1. Start engine from cold (or 1 hour after last used)2. Monitor temp gauge, just before half way point turn blowers to full HOT4. Monitor temp gauge - If it rises well above normal and into the red, switch off and allow to cool5. If it stays at a normal temp (around half way) the thermostat is the suspect6. Let me know what happens - If you need any further help doing this test just reply to me
Customer: replied 1 year ago.

Hi it rose above normal after a while and would not drive kept cutting out.

Expert:  Ross replied 1 year ago.
Ok, I suspect this is the thermostat, these also suffer with faulty coolant bottle caps which allow the coolant to escape as steam at low temps. The cap allows the system to pressurize which increases the boiling point to approx 125c if this is leaking it doesn't help matters so its worth replacing this, they are around £8The thermostat is the most likely cause, again these are usually around £10 and should be changed before going any further.

What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex

Meet The Experts:

  • Greg



    Satisfied Customers:

    Automotive diagnostic tech
< Last | Next >
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician
  • Rob's Avatar


    ASE Certified Technician

    Satisfied Customers:

    30 years trade experience
  • uk_iaibal's Avatar


    UK Car Mechanic

    Satisfied Customers:

    Verified Car Mechanic.
  • Billy's Avatar


    Trainer/ Master Technician

    Satisfied Customers:

    Trainer 8+ years, master tech. 10+ years, SAE member
  • Mike Kelly's Avatar

    Mike Kelly

    Auto Service Technician

    Satisfied Customers:

    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.