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99 Elantra overheating?
07-02-2014, 08:21 PM
Post: #1
99 Elantra overheating?
You all helped so good with my other vehicle I thought I would pick your brains with this one. My car is overheating some how. I have the AC on and when the car is sitting still the engine gets hot and the ac starts blowing hot air. The fans appear to be blowing but it doesn't cool it off. I was looking at the box under the hood and saw a wire jumping 2 fuses so I didn't know if that was a problem either. Attached is the picture. One of the wires goes to the AC fuse. Any help in resolving this problem would be greatly appreciated.

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07-02-2014, 09:53 PM
Post: #2
RE: 99 Elantra overheating?
Nice picture and a shoemaker fix at best. What are the fuses marked and what stops working when you pull the wire?

Back to the overheating issue:
There's only a few things to cause that, so I will give you some hints.
Low coolant in the radiator (even with the side tank full)
Poor circulation due to a stuck T-stat (which is usually a problem while driving too)
Poor circulation due to a collapsed hose (jazz the throttle and watch the hoses)
Poor air flow due to debris blocking the radiator (stuff between the condenser and radiator?)
Poor air flow... Fan(s) fails to flow proper amount of air (some have 2 speeds or one of the fans has failed)
Poor air flow due to body damage
Bad head gasket (but that usually gets worse while driving)

Fill in the blanks and maybe we can find a solution.
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07-02-2014, 10:21 PM
Post: #3
RE: 99 Elantra overheating?
The fuses are labeled ac and the other say car alarm.

I think the over heating might be the fan relay. The fans would only run with the ac on. I switched the rad fan relay and the condenser relay and the fans wouldn't run.
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07-02-2014, 10:26 PM
Post: #4
RE: 99 Elantra overheating?
That's a good start. The fans MUST run when the temp climbs or the AC is on, although the normal situation for temp is probably 220 - 230 degrees before the fans kick in. IOW, a little higher than most people expect.

Get yourself a new relay and see how that goes then work on why someone added the wire. Perhaps it as easy as one of the fuses is blown?
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07-04-2014, 03:32 PM
Post: #5
RE: 99 Elantra overheating?
This is an image of the cover with a line showing where the fuses are jumped.


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07-04-2014, 04:55 PM
Post: #6
RE: 99 Elantra overheating?
I'd still like to know what changes if you pull out that wire. Also see if the fuses are ok.

Just a guess but if the fuses are ok then either the AC has an issue or the alarm (anti-theft) has something wrong and adding that wire allows the car to start / run. You should probe the fuses (both ends) with a test light to see if there's power going through as well. One thing that seems odd is that wire going from the top of one fuse and then to the bottom of the other. Usually in a fuse center the "hot all the time" and the "switched with the key" fuses are grouped together and all fed from the same direction. IOW, left to right or right to left. If you find one of those fuse sockets has a loose connection or has no power then you should remove the fuse box and look at the back side. Perhaps something will show as burned or a wire has backed out of place.
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08-20-2014, 02:46 PM
Post: #7
RE: 99 Elantra overheating?
Don't know what was causing the over heating but after I changed out the air filter I haven't really had the problem again. It really needed changed. hers a pic of the new and old one.

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08-20-2014, 10:38 PM
Post: #8
RE: 99 Elantra overheating?
Sounds like an unusual fix but keep us posted if the situation changes.
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