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Engine running hot while running AC

I have a new thermostat and there is plenty of antifreeze, however everytime I try using my AC the engine starts running hot.

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It is running hot but no heat. There is a strong antifreeze odor after it has ran. Is it the thermostat?

maybe, it could be that your thermostat has locked in the closed position, not allowing coolant to flow through the engine from the radiator. your best bet is to check your thermostat before starting the engine again to avoid risk of heat damage to engine, the strong antifreeze odor could be from the little bit still in the engine cooking off or a small leak onto a hot engine part. don't really know but check your coolant level and thermostat just to be safe.

Mar 24, 2015 | Cars & Trucks

3 Answers

Engine overheating i have replaced the radiator has plenty of water

replace thermostat.then bleed coolant system, this is how you do it.fill the cooling coolant system with 50 / 50 dexcool and water to raise boiling point,straight water will evaporate boil away cause engine to overheat catch fire thats why you need 50 / 50 mixture antifreeze and bleed coolant system first fill coolant system until coolant stay at the full cold mark on the the coolant overflow jug,then you start engine allow it to idle,place the heater and ac control in any ac setting except max and the temperature control to the highest setting,run engine until lower hose to water pump is hot. with the engine hot run the engine speed up to 3000 rpm and allow it return to idle, repeat this 5 times. slowly open the bleed valve on the thermostat housing or look for bleed valve at the water pump heater bleed valve for 15 seconds to expel any trapped air.then top off the coolant as necessary,and when top radiator hose hot thermostat open up.keep adding cooling to overflow until coolant level stop at full cold mark dont over fill coolant.if engine seem like overheating while looking at cooling gauge turn off engine wait a while until cool off add more coolant until coolant level stay stable and dont drop any.when open radiator overflow cap use large rag over the radiator cap to keep from getting scald open radiator cap a little at a time but dont open radiator cap until engine cool down first.replace the radiator overflow cap, thermostat,and engine coolant temperature sensor and check the cooling fans fuses and relays see what happens.

Aug 18, 2012 | 1998 Oldsmobile Intrigue

1 Answer

Car overheats and AC stops blowing cold, then temp guage eventually goes back down and AC starts blowing cold, after a while overheats again and AC stops blowing cold again. problem just started after a...

Your AC system is supposed to shut down if the engine is hot, as a safety device-make sure when the ac is running , the radiator fan is blowing-it may not be, caused by either a bad relay, blown fuse or a bad fan motor. Make sure your antifreeze is fully up to level, and if you haven't done it in the past 2 or 3 years, get the cooling system serviced with a new thermostat-cheap insurance, you do NOT want to overheat that aluminum engine, because if you do, it will be toast.

Jun 23, 2011 | 1999 Honda Accord

2 Answers

Antifreeze light says system is low and car runs hot but antifreeze level is where it should be

Sounds like it could be a thermostat not opening. If the thermostat doesn't open then it will get hot because its not allowing the cooled antifreeze from the radiator into the engine. Your car has two circulations with the antifreeze. While your car is running it is heating up the antifreeze in the engine and when it reaches a certain temperature the thermostat opens and takes the hot antifreeze from the engine and puts it into the radiator to be cooled. At the same time the cool antifreeze from the radiator is placed into the engine to keep it cool. If your thermostat doesn't open your engine will get hot and overheat.

Feb 04, 2011 | 2000 Oldsmobile Intrigue

1 Answer

Relpaced 4.0 engine after blown head gasket. Now get faint overheat signal.Sensor on dash does not light up at ignition. New radiator, thermostat, thermostat sensor. Don't know if engine is actually...

Make sure that the engine has enough antifreeze and has been bled of all air in the system by topping off the fluid over a period of a few days of running it hot and cooling down.

If the engine is not boiling over, and you don't notice any performance problems, perhaps the false signal of overheating is being sent to the dash board.

In that case, don't worry too much about it.

You can try to measure the actual temperature of the coolant/antifreeze by using a cooking thermometer dipped into the radiator's coolant/antifreeze with the cap off (if it is of the appropriate design that allows this) starting to measure the temperature from a cold start and waiting for the coolant to circulate.

Good luck on this repair.

Dec 17, 2010 | 1995 Jeep Cherokee

1 Answer

Hi there, I've got the coolant level low sign flashing on my dashboard but there is plenty in there, what could be the problem? Also i dont know if it is linked but I have recently put oil in the engine...

The thermostat or the water pump is at fault if you have plenty of coolant in engine. To check the thermostat,start the engine and let it run to normal temperature;then with your hand feel the upper radiator hose, if it feels warm and you feel water moving the thermostat and pump is working. If not the thermostat is at fault and will need to be replaced. Also check the radiator front for any trash,bugs etc. that would block the cooling fins from getting air when you are running down the road. Also if the coolant is a brown color and not green then you will need to flush out the radiator and put new antifreeze in it. As far as the oil, you will need to add oil until it comes up on the full level on dip stick. Hope this will help you.

May 18, 2010 | Cars & Trucks

3 Answers

Unable to get my 2003 chevy blazer to start. has been acting funny. the hot air has been running cold and takes the ac a long time to get cool. the engine runs hot.

get a mechanic to have a look ,water level low hence the heater is cold and ac taking a long time to cool because the fan isnt starting up when ac is turned on ,Sounds like your fan is playing up and you may have cooked the head gasket??

Sep 12, 2009 | 2003 Chevrolet Blazer

3 Answers

I have a 98 cavalier. it runs hot after engine is runnung for a while. the fan comes on and helps it a bit but not enough. and the air from the heater inside never gets warm , where do i start? thx

It sounds like you need to service your cooling system. The cooling system may need to be flushed out due to dirty from corrosion. A sign of no heat in the heater and the engine is hot is low on antifreeze in the system. Check the antifreeze level first and add water just to get around to buy the things you need to service the cooling system. Buy antifreeze and a thermostat, drain the old antifreeze and replace the thermostat. Add new antifreeze with a 50/50 mix solution water/antifreeze. Too much antifreeze will gel and the cooling system will still run hot and to much water will boil over. Good luck. Keep me posted be glad to help.

Jun 23, 2009 | 1998 Chevrolet Cavalier

1 Answer

Engine gets hot

There are 3 potential problems:
--faulty thermostat. If it is not opening all the way by the time the engine reaches 160-180 deg F...then coolant is not flowing enough.
--partially blocked radiator caused by build up of rust over the years if never flushed as regular maintenance.
--Insufficient coolant to water ratio. Should be at least 30% or more coolant in the radiator.
--Or combination of above.
Hope this helps.

Mar 17, 2009 | 1996 Honda Accord

2 Answers

Engine running hot

Sounds like your antifreeze level is low. When it flows you get hot air and when there's an air bubble due to lack of antifreeze all you'll get is air.

Aug 10, 2008 | 1999 Chevrolet S-10 Pickup

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