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110 degree weather overheating w/AC on?

 
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Old 01 Jul 2013, 06:52 pm
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Default 110 degree weather overheating w/AC on?

car: 2003 PT touring
location: central valley, CA
weather: Summertime Heatwave(today 110-114 degrees)
new parts: Radiator Fan

Is it normal for the PT to go a little over the half mark on the temp gauge (a little under the 3/4 mark) with the AC on??? The temp gauge starts to climb up between 105-110 degree weather, but anywhere under 105 degrees the temp needle goes back to half mark.
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Old 01 Jul 2013, 07:06 pm
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Question Re: 110 degree weather overheating w/AC on?

What does it read with the AC off?
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Old 01 Jul 2013, 09:13 pm
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Default Re: 110 degree weather overheating w/AC on?

Quote:
Originally Posted by Busa_Powered View Post
What does it read with the AC off?
With the AC off, the needle goes back to normal(half way mark) with it idling for 10-20 minutes *tested.
Other than that, when I have the AC on and i'm stopped at a light with an outside weather of over 105 degrees, the gauge temp starts to climb.

Last edited by 4DR_Lou; 01 Jul 2013 at 09:16 pm.
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Old 01 Jul 2013, 09:20 pm
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Default Re: 110 degree weather overheating w/AC on?

Sounds like one of the fan relays or the fan itself has gone out for the high-speed. I had the same thing happen to mine and it was a bad fan
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Old 01 Jul 2013, 09:25 pm
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Default Re: 110 degree weather overheating w/AC on?

It's a brand new fan, not even two days old.
When I cold start the car and turn on the AC, low speed comes on.
I wait till car fully warms up with AC off... smoke a cigarette while i'm waiting in front of the car till I hear the high speed come on. So no, it cannot be the fan/relay.

*I've also fully bled the coolant system after fan install.

Last edited by 4DR_Lou; 01 Jul 2013 at 09:30 pm.
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Old 02 Jul 2013, 04:00 pm
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Default Re: 110 degree weather overheating w/AC on?

bump.
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Old 02 Jul 2013, 04:41 pm
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Location: st james mo
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Default Re: 110 degree weather overheating w/AC on?

did you replace the theromstat?
did you do a rad flush???

last year here in missouri we had that kinf of heat and mine would stay right on the half way mark
but really as long as it never goes higher its probaly ok
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Old 02 Jul 2013, 07:29 pm
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Default Re: 110 degree weather overheating w/AC on?

The needle goes above the half mark almost near the next line on the temp gauge. I replaced the thermostat and did a radiator flush about almost a year ago. I'll see if replacing the thermostat would do the trick or flush it again.

Thank you
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Old 02 Jul 2013, 11:58 pm
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Default Re: 110 degree weather overheating w/AC on?

First I have to LOL at the responses from the members that do not live in our area right now. I am in Lincoln CA BTW! Hit 117 over the weekend.
Next invest in an Ultra Gauge it will be the best single investment you can make for your PT.
And as for the temperature gauge raising slightly above the middle position in our area of California right now if you are driving anything but an easy 55-60 mph the gauge with AC on will climb above the mid way point.
You need to start to worry if you get close or at the 3/4 mark on the gauge.

Reading the responses by you from other members comments IMO you did everything correctly and I doubt you have any problem? If you are anywhere close to me pm and I will give you me address you can bring your PT by and i can check it out for you.
Once again take a moment and look at the Ultra gauge for something to have in your PT. If you had one you would feel better about what is going on with the coolant and also be able to know of concerns before they get to the point of damaging something?

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Last edited by NitroPT; 03 Jul 2013 at 12:00 am.
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Old 03 Jul 2013, 04:25 am
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Default Re: 110 degree weather overheating w/AC on?

lou; sounds like your radiator has reached it limit of cooling capacity. A flush might help, but a new radiator would be better, especially if you could buy one with a higher cooling capacity. Or, you could move?
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