AC causing the car to overheat on hot days

GARYHYCAR

MEMBER
2004 HYUNDAI VERNA

Hi guys

I have a problem with a hyundai verna model from 2004. I would appreciate any help with this problem

the problem is that it overheats only when
its a hot day and I am stuck in traffic and and the AC is on. Sometimes it overheats during motion but only on hot days and when the AC is on.
The way it overheats is that it goes outside the proper temp mark and stay somewhere in the middle between the danger red mark and proper temp mark.

It doesn't overheat in any other situation.

here is what I did so far
- replaced the radiator
- replaced the radiator cap
- Flushed the cooling system
- Flush the external of the radiator and the ac condenser

what else should I do?
I would appreciate any help

notes;

1)the condenser had a very small hole in it after a minor crash ( it got pushed up against the radiator and one one the radiator screws or sth poked a hole into the condenser) and I got it welded shut.

2)the radiator fan is not the stock fan of the car. Is there a way to confirm that its blowing at the right speed. I made sure that both the ac fan and radiator fan are running when the car overheats.

3 Replies

HMAC300

MECHANIC
48,601 POSTS

If it'snot in the danger area it's not overheating it is running a little hot. Check for air in system and make sure fan is running when up to temp. If you have one of those "bug screens" in the front of car take it off because that blocks 15% of air flow and could be your problem. It also may be the stop and go traffic on a hot day that is causing it not giving you good air flow through your system.

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Thursday, August 1st, 2013 AT 6:05 AM

GARYHYCAR

MEMBER
2 POSTS

Thanks for your help.

So I can keep driving with the ac on when the indicator is halfway between the ideal temp and the red mark. I did notice a significant drop in the cooling of the ac though.

When it starts to leave the ideal temp mark, I pull over and make sure that both the radiator fan and the ac fan are working. But again the radiator fan is not the original stock of the car model. How can I make sure that even that its spinning, that is spinning at the needed rpm.

I idled the car for about 20 min with the radiator cap removed to burp out any air bubbles but still the problem exists.

The water pump is new. I am lost as to what to try?

Here is two things that I noticed that I don't knew if they are normal or not nor their relevance to the issue.

1) when I start up the car first thing in the morning, I popped the hood to see when will the radiator fan kick in. The car slowly build up temp to the ideal level. I remained idling at the ideal temp for about 15 minutes and still the radiator fan didn't kick in. I got fed up and just left for work. Does this mean there is sth wrong, put in mind that when I turn the ac on, both fans work instantly.

2) I can squeeze the upper hose coming in the radiator when the car is hot; does this means a lack of pressure in the radiator. I don't see any visible coolant leaking and the radiator cap has just been changed.

Cheers

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Thursday, August 1st, 2013 AT 8:15 AM

HMAC300

MECHANIC
48,601 POSTS

You can always get the correct fan for the car either from a junkyard or new if it's not the stock one. If the fan isn't working it won't be turning. We don't have that model here is u.S so not sure what type of fan it takes but all the u.S. Models show two fans one for condenser and one for radiator. So that may be your problem. Check underhood for 2 fan relays it should be marked under cover of fuse/relay box if there are two see if you are missing a fan

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Thursday, August 1st, 2013 AT 9:57 AM