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Luke Warm Heat

 
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Old 22 Nov 2018, 01:00 pm
CherylM's Avatar
Fresh Cruiser
 
Join Date: May 2011
Location: 3rd Rock
Posts: 25
Default Luke Warm Heat

2007 PT Cruiser - 105k
I purchased this vehicle from Carmax and it had about 50k or so mileage.

This season I noticed that the heat is lukewarm at best. I have done abit of research on the problem and this is what I have found so far.

Good air flow inside the vehicle
A/C works fine...good and cold
No leaking from the heater core inside the vehicle
Coolant level was topped off...although I would say it is due for a good drain and flush from the looks of the condition of the antifreeze

I drove about 5 or so miles and checked the hoses coming out of the heater core. Bottom one was nice and hot (but not too hot to be touched)...top was just warm/lukewarm.

What are your suggestions for a next step ? I am trying to refrain from taking it to a shop and throwing my $$$ at it.

Thanks in advance
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Old 22 Nov 2018, 01:56 pm
Macgyverman1123's Avatar
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Join Date: Nov 2017
Location: Raleigh, N.C.
Posts: 242
Default Re: Luke Warm Heat

Based on your heater hose diagnostic, I'd say you have a clogged/partially blocked heater core. You could try flushing it. Flush it one way, switch the hoses and go the other way. Then repeat. Just use a common garden hose! Good luck!
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Old 22 Nov 2018, 07:02 pm
LionPT's Avatar
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Join Date: May 2014
Location: Central Florida
Posts: 4,423
Default Re: Luke Warm Heat

Quote:
Originally Posted by CherylM View Post
2007 PT Cruiser - 105k
I purchased this vehicle from Carmax and it had about 50k or so mileage.

This season I noticed that the heat is lukewarm at best. I have done abit of research on the problem and this is what I have found so far.

Good air flow inside the vehicle
A/C works fine...good and cold
No leaking from the heater core inside the vehicle
Coolant level was topped off...although I would say it is due for a good drain and flush from the looks of the condition of the antifreeze

I drove about 5 or so miles and checked the hoses coming out of the heater core. Bottom one was nice and hot (but not too hot to be touched)...top was just warm/lukewarm.

What are your suggestions for a next step ? I am trying to refrain from taking it to a shop and throwing my $$$ at it.

Thanks in advance
Some don't show signs of leaking in the Cruiser because it stays in the housing.
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Old 23 Nov 2018, 07:05 am
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Join Date: Jan 2013
Posts: 1,266
Default Re: Luke Warm Heat

Cheryl; when your heating/cooling system is working properly the temperature gauge should be a hair under half way. The coolant level should be checked when the engine is cold. The coolant level should be full under the radiator cap. The plastic reservoir tank should be about 1/3 full. Check both rubber seals under the radiator cap for damage. Check the tank hose for cracks or looseness.

A bad thermostat or air in the system would be my first guess.
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