Khaledma2000

Dears , yesterday the mechanic advised me to change the radiator ( of course without bothering him self to open the engine cover at least !!!!) 

I decided to go with other workshop and i should guide the mechanic this time

Iam thinking to start with replacing thermostat then check , next if not solved to replace water pump , and finally the radiator.

Please share your advices how i should trace this issue .

Note : all above parts i never replaced since i bought the vehicle around 4 years ago.

Thanks

On 9/17/2018 at 6:51 PM, Barry said:

A lot of people here confuse overheating and running warm. When the car overheats, it blows steam out the radiator cap. Running warm is no big deal and not worth worrying about. 

@Barry where you mean by "here" is it UAE ?

for me i will not give importance to little changing in heat needle reading if it will not reflects on vehicle performance and condition,,, this minor change lets the car enter to "crazy mode " as i explained.

On 9/17/2018 at 11:19 AM, Gaurav said:

So there is definitely something wrong, but nothing to panic as it's very minor movement and it returns to normal when you start moving and air circulation improves.

For the gear thud, is something more worrying on what you are explaining that from 2nd to 1st downshift there is a big noticeable jerk

Finally i found somebody confirms that heat gauge reading should be near to C and i dont have underheat issue , hehe.

@Gaurav for gear thud issue its also gone once i move and heat needle becomes below first mark , so i think its also linked with getting vehicle warmed or overheated. Maybe becose the gear radiator is getting more warmed.

Regarding changing gear oil are you sure its ok to change? Coz in last maintenance i asked the dealer to change it but he told me if yiu you change it will destroy your whole gearbox and for Nissan and Infiniti vehicles its a lifetime oil.

On 9/16/2018 at 11:33 PM, desertdude said:

Overheating! That needle is on the first mark on the cool side. What makes you think your car is "overheating" 

I think you have other problems, get a diagnostic code reading and live data feed before you start throwing more money and Parts at it.

I already checked diagnostic code and no faults , in fact am sure that car is getting overheating or at least running warm but in both cases its affected the overall car performance once the needle reached to first mark above C or little bit exceeded while returns good once needle becomes below first mark. So definitely my problem is related to heat .

I saw multiple replies that my vehicle heat needle shows under-heat which am not sure weather my vehicle heat needle like other all GCC Specs Infiniti's , so if someone have FX with GCC specs please to share about this matter.

As i said earlier i driven this car for almost 4 years with heat needle just below first mark above C and i asuumed this is the normal.

On 9/17/2018 at 12:21 AM, treks said:

Yeah, and the idling speed seems fine, too.

@treks please see both photos for RPM , considering AC working in both photos.

8 hours ago, desertdude said:

Overheating! That needle is on the first mark on the cool side. What makes you think your car is "overheating" 

I think you have other problems, get a diagnostic code reading and live data feed before you start throwing more money and Parts at it.

See pic. , This is the optimum condition for heat and RPM ,  the vehicle with me since more than 4 years and this was the heating gauge marking all the time. Iam not sure other Infiniti like this or no

1 hour ago, desertdude said:

Yeah so this 

 

VS

A simple bypass 


 

Just for updating my case , last week i went back to same workshop and asked mechanic to cancel the bypass for heater pipes under my responsibility, i said return everything as it was and let me drive it couple of days to evaluate the situation, the surprise was that after returning the heater pipes to original status i didn't get the bad smell back from AC inside the cabin and AC working perfect like freezer ( dont ask me how bad smell not returned coz i dont know , hehe ) .

However, still am suffering from slight overheating while car is standing or moving slowly which is affecting on overall car performance and make me feel nervous, as i said am starting to get grindings noises , RPM become higher the norm , and car want to go forward like you push the acceleration paddle,also when i slow down till 0 speed the gearbox shifting very rough from 2nd to 1st like someone hit you from back , AC performance becomes bad , whether temperature on dashboard raised over 50 c°!!

and all of these observations gone and car returns normal when i drive it on speed 100km/h for around 1 min and vehicle keeps normal as long as i keep driving on highway.then again returns back to "crazy mode" once i stuck on traffic and so on!!! .

Even in the night its doing the same , i cant believe that my dashboard shows weather temperature is above 43 c° in the night!!

Please look to this pic while the car is in overheating condition, is the temperature gauge reading is normal like this? Also have a look to RPM reading while its on N position,its higher the norm

Dears , any recommended workshop in Abu Dhabi that can really diagnose the causes with reasonable rates for repairs?

16 minutes ago, desertdude said:

If car is overheating while standing then its the engine cooling fan, maybe the replacement fan is not as good as the original or the second fan is on its way out, Also keep in mind last couple of weeks its been really hot too so a few degrees up and down while stationary shouldnt be too abnormal as engine is getting heat soaked just standing and just as a good preventive measure I would replace the radiator if it hasn't been changed for a long time and/or not flushed every few years. it cab start to clog up with dirt and deposits and lose cooling capacity.

Thanks for your valuable inputs , as next step i think i have to return the water heater connection to the original situation and see how is things will go on. I hope it will resolve the issue . If not ( and i hope not ) i will proceed with radiator replacement which i think will be costly.

Last few weeks i spent over 1500$ for replacing AC compressor, condenser,AC filter, cooling fan , main engine belt

12 minutes ago, Barry said:

You need a new mechanic. Anyone who removes the pipes to the dashboard doesn't understand how a vehicle cooling system works. When you bypass the heater matrix, you're taking a huge chunk of circulating coolant out of the system. Less coolant flowing through the system means the engine runs hotter. More chance of overheating and causing serious damage. I would go back and kick him in the balls and tell him he doesn't understand the most basic things about how a car works.

Check that inside the radiator is clean and the fins aren't blocked and that the "mechanic" has filled the system with coolant and not just used tap water. Check that the fan comes on when the vehicle reaches temperature at idle. I would be inclined to check that the water pump is working properly too. Worth taking a look at the recirc flap and control motor too.

The bad smell could be bacteria in the system. It happens in this humid weather. You can buy cans of special disinfectant that you spray into the air intake with the ac running. 

Seriously though, find another mechanic. This guy hasn't got a clue, he's a butcher.

Thanks Barry for your information, me too i was not satisfied when he advised to bypass water heater pipes , however do you think is there any kind of links between AC bad smell and water heater matrix?