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Unread 05-23-2011, 06:21 PM   #1
granger
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Join Date: Jan 2009
Location: LA
Posts: 18
New radiator now no heat!

2004 3.7L. We just had the radiator replaced as well as the top and bottom radiator hoses. There is now no heat. The top hose is hot when the car is warmed up (temp gauge at 12 o'clock) but the bottom hose is cool. Is there a thermostat in the hose that is not opening up? Did they install the thermostat backwards?? My wife picked up the car. When I finally looked at it, it needed a lot of radiator fluid. I've put almost 2 full bottles in of pre diluted mix in since it came back from the "shop". Please help.

Thanks,

Nick

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Unread 05-23-2011, 06:49 PM   #2
tjkj2002
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The system was not "burped" properly.On the upper radiator hose there is a plug you can remove(8mm allen) to help bleed the cooling system.
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Unread 05-23-2011, 07:35 PM   #3
tbmatthews82
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^Beat me to it.

No heat is caused by no coolant passing through your heater core. That means you've probably got air in your system and it needs to come out. Either run your Jeep with the Coolant Bottle Cap off for a while and see if the coolant level drops (air comes out). You could also take the Libby off road and rock her around real good, and that should knock the bubble out.

No offense the to above poster, but that "bleeder" bolt hasn't been worth a $*** from my experience.
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Unread 05-23-2011, 07:37 PM   #4
granger
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Bingo

You were spot on. A little burping and she's blowing hot - not much air at all really. I had previously run her with the coolant cap off thinking that would work.

The lower hose is still not hot at all though. I can rest my hand on it and feel only slightly warm. Perhaps it takes a while to open up? I thought it would have opened the thermostat up after idling for 15 min.

Thanks for your help.
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Unread 05-23-2011, 07:40 PM   #5
tbmatthews82
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Your upper hose should be the hot one... there should be a distinct difference between the top and bottom (bottom being colder). That's the point of the radiator and means your system is working properly. It'll be even colder if you have your heat on as the heater core is like a smaller radiator.
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Unread 05-23-2011, 07:47 PM   #6
granger
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Ah so. Guess I've had nothing but old tired radiators then in the past. Newer IS sometimes better. Appreciate your help.



Cheers.
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Unread 05-23-2011, 09:46 PM   #7
tjkj2002
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Quote:
Originally Posted by tbmatthews82 View Post
No offense the to above poster, but that "bleeder" bolt hasn't been worth a $*** from my experience.
Yeah it can or can not help.Mine is frozen but never had a issue bleeding my cooling system after the 4 radiators I've put in over the last 9 years.
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