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tlwesch
New User
Feb 19, 2015, 6:55 PM
Post #1 of 6
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Car won't heat up
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I have a 2003 Hyundai Elantra with the 1.6L 4 cyl. I recently installed new thermostat and a new radiator. The car now will get to a normal temp range when sitting still and idling. However, as soon as I turn the heat on the temp drops to the cold pin. It also does this if moving. Another note is the heat is not blowing out hot air. Any suggestions would be great. I was thinking maybe the mix of antifreeze to water might be off.
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 19, 2015, 7:21 PM
Post #2 of 6
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Re: Car won't heat up
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The coolant mixture isn't doing that. What temp thermostat did you install?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Feb 20, 2015, 3:56 AM
Post #3 of 6
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Re: Car won't heat up
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Still a problem with or at the thermostat. No real matter how cold it should warm up to the rating of it which must be the correct temp for engine to run properly. If a heater can cool the engine by itself it's not closing off cooling a the radiator - thermostat closes when up to temp and a heater isn't large enough to cool an engine. Same with HT, it's not a strong mix of coolant doing this that can be a problem for hot weather more than cold weather,
T
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tlwesch
New User
Feb 20, 2015, 6:59 PM
Post #4 of 6
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Re: Car won't heat up
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I believe the temp gauge is 180 degrees. Should I open it back up and check the thermostat and reseal gasket etc?
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Hammer Time
Ultimate Carjunky
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Feb 20, 2015, 9:04 PM
Post #5 of 6
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Re: Car won't heat up
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180 is probably too cold. That probably should have a 195 thermostat. You should be able to find out by checking the part number on your receipt.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Feb 20, 2015, 9:04 PM)
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Tom Greenleaf
Ultimate Carjunky
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Feb 20, 2015, 10:53 PM
Post #6 of 6
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Re: Car won't heat up
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Can't look it up right now but has to be wrong and or wrong thermostat. Can't think of an automotive application for ages that would use that temp but see them for sale and lower too.
Anything I can think of want the exact correct one properly installed. Some can be installed upside down and some even indexed for position - not sure but this running cold thing only smacks of improper thermostat.
Hey, either a 180 or 195F are both closed and coolant should remain at least at 180 in either. The 195 just goes up to settle there. This dropping temp with heater lower than even a 180 doesn't jive.
What's the actual air temp you are dealing with? I've only seen a heater core be enough alone to cool an engine (they are small radiators) at really insane cold temp like more than 25 below zero F.
Whatever the issue you started with it's still point to the thermostat. If a problem knowing it's correct get one at a dealer it's too critical to be right, installed properly and all air out of the system with proper mix (5/50) is standard. Shocking but just 60/40 stronger mix drops the freeze temps tons colder than the -34F 50/50 gives you.
The problem with antifreezes made (about all) ethylene glycol is it's a lousy product for heat transfer noticed when very hot not at any temp you would be asking for heat. Pure product undiluted concentrate is NEVER advised and would be a problem and oddly pure product does get thick and slushy at below just zero but even 5% water would change it and work and if that happened you would want to change that but it isn't the up front problem here.
To prove it feel the upper radiator hose while it warms up. It should be stone cold the whole time till it reaches set temp but bet you can feel it getting warm a little way before now - proof it's just wrong,
T
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