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Re: 1998 hyundai excel overheats when the air-con is...
Check your auxillary fan. once the a/c is turned on, the fan should kick on, if not, check your fuses and relays. with the key off try to spin the fan and see if they turn. if not replace the fans.
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Watch the engine idle long enough for the coolant heat make the radiator cooling fan cycle on and off at least twice. This way you know the cooking fan circuit functions. Other test is turn your air con switch on, then the cooling fan should turn on with the air con. One more is when the overheat light comes on, turn on your air con to make the cooling fan run. Last i want to say is find the coolant temp sensor fan swith , usually on the radiator, and inspect the connection for loose, faulty, good, bad.
The air con fan comes on when the air con is engaged, the engine fan comes on only when the engine reaches operation temp. controlled by a temp. switch. on the block or radiator .
https://www.google.com.au/search?q=Main+relay+location+on+hyundai+excel+1998&rlz=1C1AOHY_enAU708AU708&espv=2&biw=1024&bih=673&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjbwY_JkZjRAhXJupQKHZ85AbYQsAQIGw ------this shows where it is :)
if it is a rectangular cover then most come of by squeezing both the long side to release the clips of the cover. If it is round try turning the cover as removing a jar lid
You may have freon in system but compressor won't engage unless it's full under pressure. By jumping the the relay you're doing damage to compressor by running on low pressure. Have system evacuated and recharged to proper amount of freon - usually 4 lbs of freon
replace the IAC. this is the idle air control. it is located on the upper portion of the intake or on the throttle body. this unit con trols the idle speed.
Did you flush out the heater core when you did the radiator.Im not sure how the air con could overheat your engine unless the pump was creating excessive drag.Is the heater tap and controls for the heater assembly working correctly?were the two heater hoses refitted correctly.have you checked that coolant is flowing freely through out the water system
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