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Over heating problem , Toyota coaster year 2008. Change radiator, fan,and it still overheat. The head is ok.

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  • Expert
  • 80 Answers

Flush the entire cooling system until water coming out is crystal clear, then check the, thermostat, and the coolant temperature sensor, also check the engine / radiator cooling fan, the water to coolant mix ratio should be mixed to 50/50.

Hope this helps.

Have a nice day.

Posted on Apr 15, 2015

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  • Toyota Master
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Bad ect engine coolant temperature sensor

Posted on Apr 15, 2015

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  • Master
  • 372 Answers

Did you replace thermstat? I would start with that. If still trouble have a block check performed

Posted on Apr 15, 2015

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Posted on Jan 02, 2017

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SOURCE: 1989 Mazda B2600i pickup overheats. Replaced

you just said it you need a new fan clutch

Posted on May 12, 2009

csmock132
  • 4669 Answers

SOURCE: 91 toyota camry overheating problem

It doesn't overheat with the air off? It sounds like you aren't getting enough airflow thru the radiator. Radiator fans not working or leaves and dirt stuck in the radiator.

Posted on May 26, 2009

savindude
  • 175 Answers

SOURCE: 1993 toyota corolla/ overheats,fan connected directly

It could be the electric fans bad or relays or temp control sensor.

Posted on Jul 13, 2009

greg_margo
  • 1959 Answers

SOURCE: overheat 2001 hyundai tiburon

Only 2 parts remaining are the thermostat and waterpump. Always start with the thermostat when diagnosing an overheating problem. If the car is overheating constantly under all conditions and coolant is backing up into the reservoir, it's very likely to be the thermostat. If it only overheats at low speed or idling, it's more likely the waterpump.

Posted on Aug 11, 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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With due apologize I do not know about the model year, engine code and other specs of your car. But check the following to solve the problem.
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It doesn't overheat with the air off? It sounds like you aren't getting enough airflow thru the radiator. Radiator fans not working or leaves and dirt stuck in the radiator.

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