Coolant decreases during summer

[mohsin-212]

In winters my car does not decrease coolant but as Summer starts and I use AC, coolant level drops very often like I have to almost 1 liter in 15 days what could be the possible cause? If head gasket is damaged then it should decrease throughout the year but this happens only in Summers while AC is used . Any suggestions???

[murtazamohammad54]

what Coolant are you using?
since most of the coolants here are just coloured water.

[rajaahmed96]

May be there is a leak, tiny leak. Check hoses and heater then radiator and also replace radiator cap.

[FaatehRehman]

Either a minor leak, or second cause is that you AC system is not working properly, specially the condenser; it might be choked partially. That might be causing the coolant to heat and boil, thus evaporating. You can check this; after your car has been in city driving with AC on for a while open the reservoir coolant bottle and check if coolant is evaporating. Minor evaporation might not be detectable.

[smiling.tulips11]

Radiator cap seems to be the culprit.

[behram.ali]

Get your radiator serviced and monitor any leaks from inlet or outlet pipes.
And afterwards use a competent coolant to top up the system.

[mohsin-212]

I am using caltex coolant mixed in 50:50 ratio with distilled water

[mohsin-212]

I also thinking the same

[mohsin-212]

Also cooling fan runs on higher speed all the time with AC. As per my knowledge it should run at lower speed with AC higher speed is for coolant

[murtazamohammad54]

It is a good Coolant so you most likely have a leak somewhere.

[umair149]

If cars is not overheating, and ac is working fine the chexk in following order

1) leaks in coolant lines.
2) radiator cap.
3) choked radiator.

[sameerulhaq064]

Monitor your car's temperature.
Also, get the cooling system flushed and get your radiator cap checked. Your car's cooling system has a minor leak

[mohsin-212]

Radiator is flushed recently, but cap was not changed, then I should try changing cap

[mohsin-212]

Monitor your car's temperature.

It remains in the range of 88-95 depending on drive specially when I turn ON AC then it hardly reaches 97 as fan runs all the time

[sameerulhaq064]

Yes, change the cap and check.
Also, what's the condition of the upper and lower radiator hoses?

[mohsin-212]

One possibility of leakage is from Thermostat housing as engine block is rusted from spot and its sides are scraped off so mechanic sealed it with magic epoxy and checked it for any leakes and found Ok

[sameerulhaq064]

Use gasket sealant there.