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Heater & Ac not working right

 
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Old 15 Dec 2015, 03:17 pm
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Default Heater & Ac not working right

I have a 2008 PT Cruiser. Purchased couple years ago after being repaired from hitting a deer. In Summer after about 45 minutes highway driving the AC freezes up and won't work. In the winter after about 45 minutes of highway driving the heater stops circulating and it is cold in the car. Both times you can hear the blower trying to work and feel slight air coming from vents. (hot from heater and cold from AC) This makes this car not a very good highway car. I have had the AC recharged and all fans on motor are running. Where should I look on the inside of the car. Thanks mark
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Old 15 Dec 2015, 03:54 pm
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Default Re: Heater & Ac not working right

Flush the heater core and see if your heat improves. The a/c sounds like you have a line that got partially crushed from the deer. Now, I'm not a mechanic, so don't take my word for any of this. I'm just a speculator.
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Old 15 Dec 2015, 08:22 pm
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Default Re: Heater & Ac not working right

You said both times the blower motor sounds like it's trying to work. Maybe the blower motor is shot. As you mentioned, it has heat, just not blowing into the cabin very well. Same goes with the air conditioning.

Just something to consider. Found a youtube on how to either replace or check to see if it's functioning properly:

http://www.bing.com/videos/search?q=...ED3&FORM=VIRE1
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Last edited by soyomb; 15 Dec 2015 at 08:27 pm.
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Old 16 Dec 2015, 11:12 am
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Default Re: Heater & Ac not working right

Thanks. I will try both.
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Old 28 Jan 2016, 09:09 pm
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Default Re: Heater & Ac not working right

flushed heater core and checked lines. Changes the blower motor and still after approximately 45 minutes of working fine the heater air starts to decrease. The temperature heat is still hot but much less air flow. sounds like motor is running fine and you can hear the speed setting change just no air flow. Is there some kind of vent flap or something that regulates the air flow? Thanks Mark
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Old 28 Jan 2016, 09:21 pm
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Default Re: Heater & Ac not working right

This is just a guess...have you checked the fresh air vent behind the windshield washer fill tank..??
You will have to remove the cowl to access to check if it's clogged or blocked.
Even if you don't have the cabin filter box, the hole is still there & open.
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Old 29 Jan 2016, 06:37 am
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Default Re: Heater & Ac not working right

When my A/C froze up (twice), both times it turned out to be the low pressure switch on top of the accumulator. Easy to replace as you don't loose the R134 when you replace the switch. You just have to watch out for the tiny "O" ring on the threads as you can over-tighten it when screwing down the new switch.

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