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 Robert Your Own Question

Robert, UK Qualified Car Technician
Category: Car
Satisfied Customers: 4535
Experience:  Fully qualified / self employed garage technician in the UK
Type Your Car Question Here...
Robert is online now

Just driving on the motorway in my smart car 59 plate 1.0

Customer Question

Just driving on the motorway in my smart car 59 plate 1.0 and it lost acceleration on the motorway
Luckily I was near a service station. As I pulled up, the car lost acceleration completely and couldn't accelerate anymore and rolled to a stop.(in the car park)
When I stopped
The engine started smoking (white smoke) and the anti coolant is cold to the touch and leaking from the front
I'm thinking the engine has blown or belt has broken
Any ideas
Submitted: 7 months ago.
Category: Car
Expert:  Robert replied 7 months ago.


The water pump is driven off the main belt..if that hasnt been working properly due to either the belt failing.or as ive seen on one or two occassions the alternator pulley seizing up and thus this burns the belt out which you'll know straght away if you look at the belt and see load of burnt rubber fragments around,stuck to all the pulleys. and of course means the water pump wont turn..this will cause the car to overheat leading the headgasket failure very quickly..because there is no coolant circulation around the engine...the leak will need to be traced by performing by pressure testing the system once its been towed to a garage as this will verify if the pump has gone or leaking..they may also have to check to ensure the headgasket hasnt gone too..if it has then it maybe more cost effective to put another engine in to be honest if thats the case..I do hope this helps...

Customer: replied 6 months ago.
That's greatThanks for your help. The AA guy send more or less the same thing.
Do you know what kind of cost I'm looking at if I have to get a new engine?The Aa guy said it might also be the alternator. Are they expensive also?My smart car is the start stop version.
Expert:  Robert replied 6 months ago.

Hi..there..apologies for the delay..

Normally you would need to go reman engine..thats engines rebuilt and would be best cost effective wise to be honest...try visiting this site "click here" and see what they can do...but at this point if not already diagnosed id say you would need to rule out whats and if thats whats happened as per what i sigested above in the last post..

Alternators arent cheap maybe looking at £300-£400 for one plus the fitting ontop..which again i can be specific on based on the varied labor rates across the UK..

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
< Previous | 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.