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Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Nissan
Satisfied Customers: 560
Experience:  30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Normal operating temp at idle. on the road heat gets cool

Customer Question

normal operating temp at idle. on the road heat gets cool and temp gauge goes to hot. replaced radiator and thermostat. removed and checked water pump. checked for exhaust gas. any ideas ?
JA: Have you checked the coolant? Have you noticed any leaking?
Customer: no leaks, flushed cooling system and made sure no air pockets
JA: What is the model/year of your Nissan?
Customer: 2005
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: radiator,thermostat and flushed cooling system. checked waterpump.
JA: Anything else you want the mechanic to know before I connect you?
Customer: not at this point
Submitted: 2 months ago.
Category: Nissan
Expert:  Chad Farhat replied 2 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Customer: replied 2 months ago.
Thanks
Expert:  Chad Farhat replied 2 months ago.

Hey how are you

1- have you checked oil , is milky color, are you mixing coolant oil ?

2- are the coolant fans running & if they are running are they running fast or slow ?

3- is the radiator shroud around the fan still there

4- how did you check the water pump ?

5- at idle you said temp is good & on the road good, so when is it hot ?

6- are you using coolant are you having to add to it

7- any pressure build up ,can you squeeze the water hose by hand ,is thermostat getting stuck at times or you said replaced new ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 2 months ago.
Fans are running at normal speed. No breaching normal temp at idle and goes to hot on the road and heat gets cool. Checked water pump by removing and checking impellers and making sure timing chain was on gear properly to drive pump.no pressure build up and shroud is properly installed
Expert:  Chad Farhat replied 2 months ago.

heats gets cool going down the road , tells me heater core is clogged up and maybe leaking

Customer: replied 2 months ago.
Chad the vehicle overheats on the road with the heat off as well.
Customer: replied 2 months ago.
Heat is extremely hot at idle or slow driving. If the heater core was blocked I would not have great heat at idle either. The heat is going cool because of the operating temp climbing too high.
Expert:  Chad Farhat replied 2 months ago.

well man i don't know on this one ,all works but still overheat

beginning of a head gasket not enough to build pressure, you would think ,it will evaporate it thru the exhaust but it is not

Customer: replied 2 months ago.
Anyone else out there have any ideas
Expert:  Chad Farhat replied 2 months ago.

yes lt will have great heat at idle , if clogged the coolant flow will be faster going down the road so you will start having less heat

Expert:  Chad Farhat replied 2 months ago.

but hey what do i know :)

I will open up the question for you for another expert

good luck to you

Customer: replied 2 months ago.
I understand the heat possibly but I have never seen a vehicle temp.climb like this due to a heater core ?
Expert:  Chad Farhat replied 2 months ago.

i understand man, please dont reply back to me ,because it will lock the question back to me , i will opt out again for you and let another expert take a shot at it for you

Expert:  Jay replied 2 months ago.

Hello my name is ***** ***** thank you for your question.

Can I work on this issue with you when I get home from work around 7:30 pm EST?

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