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Pontiac Forum: 2005 Grand Prix Overheeating
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  #1  
Old July 11th, 2018, 03:45 PM
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2005 Grand Prix Overheeating

2005 Pontiac Grand Prix GTP Sedan 4-Door - 3800 Series 3 (Grey)

The car began to overheat earlier today, so I added some anitfreeze and that didn't help at all. There are no leaks that we could see. The hose that goes to the thermostat is hot. The car begins to smoke and cut back erratically after driving it for 5-10 minutes. The smoke comes from the oil intake but the oil is full. What could be the problem?
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Old July 11th, 2018, 03:47 PM
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Your thermostat make have failed. Remove it and put it in a pot of water and watch to see if it opens before the water boils.
Did you check your oil dip stick and oil filler cap for a brownish creamy substance?
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Old July 11th, 2018, 04:22 PM
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Quote:
Originally Posted by melsg5 View Post
Your thermostat make have failed. Remove it and put it in a pot of water and watch to see if it opens before the water boils.
Did you check your oil dip stick and oil filler cap for a brownish creamy substance?
I checked the dip stick but not the oil filter cap. Will check that. No brownish substance on dipstick. Bought a new thermostat on a hunch.
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Old July 11th, 2018, 06:23 PM
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I found the problem. When I added water directly to the radiator, I saw that water was leaking from a short, black, 90° angle hose that's about 8 inches in total length. It's almost directly across from the radiator intake. I need to figure out what kind of hose this is. Here's a pic of the hose and its location:




Is this possibly the heater hose?

Last edited by Hotsuma9; July 11th, 2018 at 07:25 PM.
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Old July 11th, 2018, 10:03 PM
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Looks like a cooling plastic elbow very cheap part to buy can be tricky to change
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Old July 12th, 2018, 10:02 AM
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does this look like the leaking part except they now make it out of metal not plastic?
https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds
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Old July 12th, 2018, 01:11 PM
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Yup. That's it. We took the car to our mechanic earlier today. Danny said that these cheap elbow connectors leak all the time and he fixes them all the time.

Last edited by Hotsuma9; July 12th, 2018 at 02:35 PM.
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Old July 12th, 2018, 01:59 PM
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Very common problem on series 2 & 3 3800's
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Old July 12th, 2018, 02:31 PM
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We've had this car for over 2 years and this is the first time it's happened. This is the only problem we've ever had thus far.
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Old July 14th, 2018, 04:08 PM
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The mechanic replaced the two plastic elbow connectors that carry antifreeze and water to the engine with metal ones. We just got the car back on yesterday. I noticed that when the car is running idle, the temp hand would go just beyond the halfway point. But when I drive it, it'll go just past the halfway point but then go back down to it and run normally. It didn't use to do this before the overheating problems started, so why is it acting like that now?
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