Civic 2005 overheats on high speed only when ac is on

[samm94]

Civic 2005 eagle eye is overheating when ac is on and speed is over 100,
below 100 it is working fine with ac on.
Without ac it is running fine even on 140 150 ,
It only heats when ac is on and i accelerate over 100.
Driven 800 km with this issue. Radiator water is full no any leakage and fan are also working fine.
Pls help what can be posible cause

Update: after servicing radiator ( was little bit chowked ), servicing condenser, new condenser fan motor , and thermostate pulling out. Problem goes way.. i tried driving at 120 130 for 2 hours heat gauge was perfect.

[zoraiz6565]

Both fans are working fine? The radiator as well as the ac condenser fan.
Is the car's engine in good condition?

[samm94]

Engine is in normal condition , both fans are fine i have get them checked, engine fan is very fast and ac fan is little slow but electrician said it is fine.

[samm94]

I have also get cheked generator it is also fine,
One mechanic told me that it could be the problm of condensor as its fins are little fold ,
But y it only heats when on high speed on highways when airflow is also gud but not heats when in city when air is also less and more hot weather in city.

[zoraiz6565]

Hmm this seems like a hard to catch issue what are you using as a coolant? Water or some proper coolant

[behram.ali]

The potential causes of a car overheating at highway speeds are a stuck thermostat, a restricted radiator, or a kinked hose.
As the car speed increases engine generates more heat despite of better air flow the thermostat has to allow more water in the system for better heat exchange.

[FaatehRehman]

A simple solution is to attach OBD scan tool with car and then test drive and monitor temperatures and AC closely. All else is "hawai firing"

[Massive_One]

Civic 2005 eagle eye is overheating when ac is on and speed is over 100,

at high speeds, the engine generates more heat, hence requires more coolant flow through the radiator and if there's blockage in radiator or coolant flow, engine heats up at high speeds.
get the radiator serviced and check thermostat valve.

[samm94]

I use water of my home ac.

[samm94]

If thermostat is faulty and is not allowing more water then y car is ruining fine even on 130 for 2 3 hours with ac off.

[samm94]

Radiator is 1.5 years old. And working perfetly, no rust no leakage, no water reduction after even long tour, and no bubbles.

[Massive_One]

y car is ruining fine even on 130 for 2 3 hours with ac off.

AC adds A LOT of load and extra work for engine, hence engine works harder and heats up a lot faster than without AC.

[Massive_One]

Radiator is 1.5 years old. And working perfetly, no rust no leakage, no water reduction after even long tour, and no bubbles.

if radiator is fine then check other hoses, water pump, thermostat valve, there has to be blockage somewhere in the system !

[samm94]

And what about condenser? It cant be faulty ?

[zoraiz6565]

No I don't think it's the condensers fault and always use a good quality coolant in car to maximize the life of radiator and other components check the hoses to the radiator and back to engine upper and lower hose it might be bent causing water flow issues.

[Massive_One]

And what about condenser? It cant be faulty ?

it's more related to AC's performance, not the car's heatup. If condenser is faulty it can compromise AC's performance, but i am expecting the AC is performing fine. The fact that car is heating up only on highway speeds , the culprit is not enough coolant flowing through the system to cool the engine down at high speed !

[sameerulhaq064]

It's either a Faulty thermostat valve or a blocked radiator. Same thing happened to my Baleno few weeks back and I ended up changing the radiator (was chocked due to rust) and also changed thermostat valve (old was fine).

[ashbal]

Get the radiator serviced first of all,proceed to anything after that,dont conciser it being 1.5 years old and just get it seevices first of all

[Mirza967]

Clean and straight clogged fins of condenser and radiator and service radiator and any of the metallic coolant hose .....change water pump ....and put good quality coolant

[samm94]

Serviced radiator, it was chowk accrding to cleaner,
Cleaned condenser with water pressure,
Changed condenser fan motor,
I will chek progress soon on long drive.