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2008 dodge caravan. Overheating on gh speeds or on a ghway.

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2008 dodge caravan. Overheating on...
2008 dodge caravan. Overheating on high speeds or on a highway. When I stop and wait it will go back to normal. Drives normal in traffic. Check engine codes are po300 po301 po303 and po138. And it shakes when I reverse
Submitted: 1 year ago.Category: Dodge
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Answered in 7 minutes by:
3/2/2016
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago
Amedee
Amedee, Dodge Technician
Category: Dodge
Satisfied Customers: 27,082
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. What size engine do you have?

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Customer reply replied 1 year ago
3.3 l
Customer reply replied 1 year ago
I have replaced the thermostat
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

Have you checked for a blown head gasket?

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Customer reply replied 1 year ago
No. But I do not see any white smoke
Customer reply replied 1 year ago
you want me do a compression test?
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

So do you know what is causing it to run rough?

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Customer reply replied 1 year ago
I found on Google that high speed overheating could be because of a clogged exhaust manifold
Customer reply replied 1 year ago
I think they are bad spark plugs
Customer reply replied 1 year ago
Cylinder 1 and three
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

Ok have you pressure checked the cooling system?

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Customer reply replied 1 year ago
No?
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

Well, I would at least start by ruling out any major stuff like a cracked cylinder head or a blown head gasket.

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Customer reply replied 1 year ago
I will tomorrow
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

If the converter was plugged up, it would prevent the engine from accellerating under a heavy load.

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Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

You can remove the fron oxygen sensor to see if that will help but I dont think this is the problem. In addition, what are the chances that two or more spark plugs when bad at the same time? It is not very likley.

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Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

The most common cause would be a blown head gasket, cooling fans not working or plugged radiator. I have seen plugged or restricted heater or coolant hoses so be sure to check those as well.

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Customer reply replied 1 year ago
I replaced the radiator as well
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

Ok, good. Then pressure checking the cooling system and running a block test or checking for HC's in the radiator would be a good things to do next as well.

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Customer reply replied 1 year ago
While back I replaced cracked plastic t houses with metallic ones. Maybe they clogged up
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

Anything is possible. It is worth checking into..

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Customer reply replied 1 year ago
When I opened the radiot cap this morning there was a pressure, even through car was cool
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

It will hold pressure for a while.. this is good. But this does not mean the head gaskets are good.

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Customer reply replied 1 year ago
Do you do pressure test while engine is hot or cool
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

With the engine cold and engine turned off.

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Customer reply replied 1 year ago
I did it and it is holding it
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

EXCELLENT!! This means there are no coolant leaks

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Customer reply replied 1 year ago
May be I did not get the right thermostat
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

I would get one from the dealership just to be sure. Then after installing it, be sure to bleed the cooling system (I am sure you did this when installing the last thermostat)

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Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

I am glad I can help!

It has been a pleasure working with you. Please dont forget to honor your good faith deposit by rating my answer as "Excellent Service" for assisting you today.

Please let me know if you have any further questions.

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Customer reply replied 1 year ago
Okey I will get one from the dealer
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

Sounds good!

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Customer reply replied 1 year ago
What is the best way to bleed the cooling system. I open the radiator cap and hit the exlrator several times
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

With the engine cold, remove the radiator cap and start it up. Let it idle until it is up to operating temp. Then pick up the engine rpms to about 1500 for about 10 minutes or until the cooling fan comes on. Then install the cap and that should do the trick

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Customer reply replied 1 year ago
Overheating problem solved but the codes keep coming back. What do you suggest I do
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

Excellent! Glad to hear we got to the bottom of it! The misfire codes will need to be diagnosed and fixed. I would check the fuel system and ignition system first and go after the Po138 as that might be causing the misfire codes.

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Customer reply replied 1 year ago
Po138 is oxygen sensor. Replace it?
Customer reply replied 1 year ago
How do I check the sensor
Customer reply replied 1 year ago
How do I check the ignition and the fuel system?
Dodge Mechanic: Amedee, Dodge Technician replied 1 year ago

You can check fuel pressure using a fuel pressure tester. One of the easiest ways to check the ignition system is to spray a light mist of water on the ignition components and see if the engine starts to run rough. If so, the tune up parts are bad and will need to be replaced.

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Amedee
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