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Old 16 Jul 2012, 12:31 pm
jim beam
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Default Re: 99 Civic--Overheat when idle w/AC on

On 07/16/2012 01:35 PM, mmurphy72@gmail.com wrote:
> My 99 Civic seems to overheat when I am at a light or parked, idling, with the AC on, it only does this in the summer months. Thermostat is new. Any ideas on what else to check?
>
> TIA


check fan operation.
check coolant level - in radiator, not expansion bottle.
check radiator for obstructions, both inside and outside.

and last but not least, check for head gasket leaks.


--
fact check required
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  #2 (permalink)  
Old 16 Jul 2012, 03:35 pm
mmurphy72@gmail.com
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Default 99 Civic--Overheat when idle w/AC on

My 99 Civic seems to overheat when I am at a light or parked, idling, with the AC on, it only does this in the summer months. Thermostat is new. Any ideas on what else to check?

TIA
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  #3 (permalink)  
Old 16 Jul 2012, 07:01 pm
Elmo P. Shagnasty
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Default Re: 99 Civic--Overheat when idle w/AC on

In article <03d1beb0-1a0f-4100-922f-8cd82124358e@googlegroups.com>,
mmurphy72@gmail.com wrote:

> My 99 Civic seems to overheat when I am at a light or parked, idling, with
> the AC on, it only does this in the summer months. Thermostat is new. Any
> ideas on what else to check?
>
> TIA


Is the radiator fan working?
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  #4 (permalink)  
Old 17 Jul 2012, 10:19 am
mmurphy72@gmail.com
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Default Re: 99 Civic--Overheat when idle w/AC on

On Monday, July 16, 2012 3:35:39 PM UTC-5, (unknown) wrote:
> My 99 Civic seems to overheat when I am at a light or parked, idling, with the AC on, it only does this in the summer months. Thermostat is new. Any ideas on what else to check?
>
> TIA


Radiator fan works fine, coolant levels are fine, no obstructions in radiator (new one installed about two years ago.) and no head gasket leaks. This only happens when it is hot outside 90+ and the a/c is on and i am idle.
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  #5 (permalink)  
Old 18 Jul 2012, 01:47 am
Dave Dodson
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Default Re: 99 Civic--Overheat when idle w/AC on

mmurphy72@gmail.com wrote in
news:7051d3ad-c1bd-431b-8e34-a8eb490ad84a@googlegroups.com:

> On Monday, July 16, 2012 3:35:39 PM UTC-5, (unknown) wrote:
>> My 99 Civic seems to overheat when I am at a light or parked, idling,
>> with the AC on, it only does this in the summer months. Thermostat
>> is new. Any ideas on what else to check?
>>
>> TIA

>
> Radiator fan works fine, coolant levels are fine, no obstructions in
> radiator (new one installed about two years ago.) and no head gasket
> leaks. This only happens when it is hot outside 90+ and the a/c is on
> and i am idle.
>


Just a possibility - check engine rpm when you're idling with ac on....as
opposed to ac off...Could be that the engine isn't turning the water pump
fast enough to circulate a sufficient volume of coolant to keep the temp
down...DaveD
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  #6 (permalink)  
Old 18 Jul 2012, 11:10 am
jim beam
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Default Re: 99 Civic--Overheat when idle w/AC on

On 07/17/2012 11:47 PM, Dave Dodson wrote:
> mmurphy72@gmail.com wrote in
> news:7051d3ad-c1bd-431b-8e34-a8eb490ad84a@googlegroups.com:
>
>> On Monday, July 16, 2012 3:35:39 PM UTC-5, (unknown) wrote:
>>> My 99 Civic seems to overheat when I am at a light or parked, idling,
>>> with the AC on, it only does this in the summer months. Thermostat
>>> is new. Any ideas on what else to check?
>>>
>>> TIA

>>
>> Radiator fan works fine, coolant levels are fine, no obstructions in
>> radiator (new one installed about two years ago.) and no head gasket
>> leaks. This only happens when it is hot outside 90+ and the a/c is on
>> and i am idle.
>>

>
> Just a possibility - check engine rpm when you're idling with ac on....as
> opposed to ac off...Could be that the engine isn't turning the water pump
> fast enough to circulate a sufficient volume of coolant to keep the temp
> down...DaveD


that would only happen if the timing belt was broken. and then of
course, the engine wouldn't run at all.


--
fact check required
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  #7 (permalink)  
Old 18 Jul 2012, 09:56 pm
Cyrus
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Default Re: 99 Civic--Overheat when idle w/AC on

jim beam wrote:

> On 07/17/2012 11:47 PM, Dave Dodson wrote:
>> mmurphy72@gmail.com wrote in
>> news:7051d3ad-c1bd-431b-8e34-a8eb490ad84a@googlegroups.com:
>>
>>> On Monday, July 16, 2012 3:35:39 PM UTC-5, (unknown) wrote:
>>>> My 99 Civic seems to overheat when I am at a light or parked, idling,
>>>> with the AC on, it only does this in the summer months. Thermostat
>>>> is new. Any ideas on what else to check?
>>>>
>>>> TIA
>>>
>>> Radiator fan works fine, coolant levels are fine, no obstructions in
>>> radiator (new one installed about two years ago.) and no head gasket
>>> leaks. This only happens when it is hot outside 90+ and the a/c is on
>>> and i am idle.
>>>

>>
>> Just a possibility - check engine rpm when you're idling with ac on....as
>> opposed to ac off...Could be that the engine isn't turning the water pump
>> fast enough to circulate a sufficient volume of coolant to keep the temp
>> down...DaveD

>
> that would only happen if the timing belt was broken. and then of
> course, the engine wouldn't run at all.


I have a similar problem with a Subaru 2.5L. Only after the engine has run
for more than half an hour and then left to idle for a short while. Temp
drops once on the road again. Replaced thermostat, no real change.
Radiator is full, no signs of leakage though maybe I am not looking in the
right place.

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Old 18 Jul 2012, 10:18 pm
clare@snyder.on.ca
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Default Re: 99 Civic--Overheat when idle w/AC on

On Wed, 18 Jul 2012 23:56:13 -0300, Cyrus <cy@rus.invalid> wrote:

>jim beam wrote:
>
>> On 07/17/2012 11:47 PM, Dave Dodson wrote:
>>> mmurphy72@gmail.com wrote in
>>> news:7051d3ad-c1bd-431b-8e34-a8eb490ad84a@googlegroups.com:
>>>
>>>> On Monday, July 16, 2012 3:35:39 PM UTC-5, (unknown) wrote:
>>>>> My 99 Civic seems to overheat when I am at a light or parked, idling,
>>>>> with the AC on, it only does this in the summer months. Thermostat
>>>>> is new. Any ideas on what else to check?
>>>>>
>>>>> TIA
>>>>
>>>> Radiator fan works fine, coolant levels are fine, no obstructions in
>>>> radiator (new one installed about two years ago.) and no head gasket
>>>> leaks. This only happens when it is hot outside 90+ and the a/c is on
>>>> and i am idle.
>>>>
>>>
>>> Just a possibility - check engine rpm when you're idling with ac on....as
>>> opposed to ac off...Could be that the engine isn't turning the water pump
>>> fast enough to circulate a sufficient volume of coolant to keep the temp
>>> down...DaveD

>>
>> that would only happen if the timing belt was broken. and then of
>> course, the engine wouldn't run at all.

>
>I have a similar problem with a Subaru 2.5L. Only after the engine has run
>for more than half an hour and then left to idle for a short while. Temp
>drops once on the road again. Replaced thermostat, no real change.
>Radiator is full, no signs of leakage though maybe I am not looking in the
>right place.

Is the fan running properly? Not sure if you have 2 fans or a 2
speed fan, but with AC on there should be a fan running constantly,
while with AC off the fan should cycle with temperature. On the run
you get enough air speed to cool without the fan on all but the
hottest days so it generally doesn't overheat until you slow down.
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  #9 (permalink)  
Old 19 Jul 2012, 12:24 am
mmurphy72@gmail.com
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Default Re: 99 Civic--Overheat when idle w/AC on



> Is the fan running properly? Not sure if you have 2 fans or a 2
> speed fan, but with AC on there should be a fan running constantly,
> while with AC off the fan should cycle with temperature. On the run
> you get enough air speed to cool without the fan on all but the
> hottest days so it generally doesn't overheat until you slow down.




Double checked again, I have two fans, one not on the radiator, running thewhole time, one on the radiator comes on after getting to normal operatingtemp. I don't know what it could be, inline cooling sensor? Since it only happens when ac is on that has to limit it to only a few things right?
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  #10 (permalink)  
Old 19 Jul 2012, 06:51 am
Tim Conway
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Default Re: 99 Civic--Overheat when idle w/AC on


<clare@snyder.on.ca> wrote in message
news:30ve08p8okdl1ilha2jollu4hdnnc5471b@4ax.com...
> On Wed, 18 Jul 2012 23:56:13 -0300, Cyrus <cy@rus.invalid> wrote:
>
>>jim beam wrote:
>>
>>> On 07/17/2012 11:47 PM, Dave Dodson wrote:
>>>> mmurphy72@gmail.com wrote in
>>>> news:7051d3ad-c1bd-431b-8e34-a8eb490ad84a@googlegroups.com:
>>>>
>>>>> On Monday, July 16, 2012 3:35:39 PM UTC-5, (unknown) wrote:
>>>>>> My 99 Civic seems to overheat when I am at a light or parked, idling,
>>>>>> with the AC on, it only does this in the summer months. Thermostat
>>>>>> is new. Any ideas on what else to check?
>>>>>>
>>>>>> TIA
>>>>>
>>>>> Radiator fan works fine, coolant levels are fine, no obstructions in
>>>>> radiator (new one installed about two years ago.) and no head gasket
>>>>> leaks. This only happens when it is hot outside 90+ and the a/c is on
>>>>> and i am idle.
>>>>>
>>>>
>>>> Just a possibility - check engine rpm when you're idling with ac
>>>> on....as
>>>> opposed to ac off...Could be that the engine isn't turning the water
>>>> pump
>>>> fast enough to circulate a sufficient volume of coolant to keep the
>>>> temp
>>>> down...DaveD
>>>
>>> that would only happen if the timing belt was broken. and then of
>>> course, the engine wouldn't run at all.

>>
>>I have a similar problem with a Subaru 2.5L. Only after the engine has
>>run
>>for more than half an hour and then left to idle for a short while. Temp
>>drops once on the road again. Replaced thermostat, no real change.
>>Radiator is full, no signs of leakage though maybe I am not looking in the
>>right place.

> Is the fan running properly? Not sure if you have 2 fans or a 2
> speed fan, but with AC on there should be a fan running constantly,
> while with AC off the fan should cycle with temperature. On the run
> you get enough air speed to cool without the fan on all but the
> hottest days so it generally doesn't overheat until you slow down.


I have a 2000 Forester 2.5 that is doing that. It's been diagnosed as a
problem with the A/C fan. It is sporadic, one time runs as it should then
doesn't run at all and runs hot. I have to use the heater to drive
normally. I have a new fan on order and hopefully that will solve it.

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