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My 406 overheats even after changing top cylinder

My 406 continues to overheat despite changing the top cylinder and top cylinder gasket, cant detect what the problem could be

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Radiator could be clogged try clean it out ,maybe take out termistat.

Posted on Dec 11, 2012

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6ya6ya
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Posted on Jan 02, 2017

johnthejag
  • 286 Answers

SOURCE: overheating after changing the head gasket

Yes, due to many things.

No ....1 Did you replace the thermostat ?

Take out the thermostat, and pop it in a saucepan covered in water, bring to the boil, and see if it opens, this will confirm if this is the fault.

If not..............

1. The cooling system must be topped up, and pressure tested to max running pressure 15lb sq in.

If there is an external leak this will show it up, possibly from cooling or heater hose, water pump, radiator, or the heater matrix.

If nothing is apparent an internal leak, must be then suspected, ie head/s or head/s gaket/s.

2. To test out this , a carbon monoxide test, should be carried out on the cooling system, by passing, a sample of the cooling system gas, when engine is at normal running temperature ,through the test fluid in the vacuum tester.
If the fluid changes color, this is proof the combustion chamber gases are escaping into the cooling system, which over pressurizes the system and normally blows the coolant out of the header tank overflow, as you drive along, and you do not see.
The other symptom of this problem, is the coolant leaks back into the combustion chambers, when the engine is switched off, and when you start later, a misfire is noticeable until the spark plug dries out.
Also if the plugs are removed, and after 1hr of cooling system pressurizing, the engine is spun, any coolant from the plug holes will confirm head, or head gasket failure.


I hope it is the thermostat....?
Let me have your thoughts !
Good Luck !

A FixYa rating is all I require...Thanks...John.

Posted on Feb 16, 2009

ButtFuzz
  • 463 Answers

SOURCE: why does my 98 deville continue to overheat?

check to see if there is a valve (usually vacuum actuated) inline somewhere on the lines that go from the block to the heater core. Maybe it is stuck...

Posted on Mar 02, 2009

  • 2692 Answers

SOURCE: 97 chrysler lhs overheats

Head gaskets don't cause overheating Usually they are a result of overheating. If the headgasket is bad one wil get leaking into the cylinders of coolant,which wil show up as milky oil.Like some one else stated ; have the radiator rodded out,(cleaned and fluashed).

Posted on May 09, 2009

  • 297 Answers

SOURCE: how do i change the intake manifold gasket

The intake manifold got nothing to do with coolant over heating if that is what you are talking about ?

Posted on Aug 15, 2009

  • 6982 Answers

SOURCE: 5.2 1994 Jeep Grand Cherokee overheats at idle

I don't remember ever seeing a Jeep that did not have an electric fan as a supplement to the mechanical one. The electric one should come on when the A/C is engaged. Jeep radiators are far smaller than they should be due to ground clearance issues. The only way to make them work is to enhance air flow through them by using electric fans. (or adding an extra row of cooling cores such as in the special tow package). When the vehicle is moving there is enough air flow created by that to eliminate the need for fans altogether, but you have to stop sometime!
Your a/c compressor adds to engine loading (why it pulls rpm down) When at idle with a/c on, the engine "thinks" it's going up-hill and produces more heat. The heat needs to be scrubbed from the system or it can and will overheat.
Make sure that the clutch fan is engaging. It spins free when cold but should lock up after it gets hot. Add an electric fan to the system...check with several scrapyards and see of any Jeeps like yours have one and take it.(some electric fans are on the drivers side and some are directly in front of the mechanical one) If equipped, there is wiring for it in the car. If necessary you can add one either inside or outside the radiator and operate it by way of a switch and relay or just a switch. (there are aftermarket ones that are "slim line) and are designed to fit between the radiator and the front grille) You could also add an external transmission cooler...in doing that, it will take some of the heat load off the radiator. Also make sure that the new radiator has the same number of core rows as the old one did....some shops mistakenly put ones with less cores in when replacing due to cost. In a system with a marginal design this can become critical. (most radiators come with one two three and even four rows)
Once the problem has been solved, don't forget to put the 195 t stat back in or the engine controls won't work properly.

Posted on May 18, 2010

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