R34 overheating

[Samyr34]

Hi all, had the car couple months. Making 300kw. Overheating on freeway but cooled down in traffic then would rise up slowly. Drained coolant and replaced thermostat. Heater wasn't working when I got the car. Went to bleed via x2 head bleed screws, rear one bleed out but front one had nothing come out as car continued to overheat. Any ideas on the matter?

[ADP91]

Sounds like a water pump

[KiwiRS4T]

First try bleeding the system properly ( with heater set to full on - check that the heater is still connected - some people just block off the hoses when the element inside the car starts leaking). Clear the blocked bleed screw. Perhaps go the whole hog and jack up the front and stick a cut off plastic bottle in the radiator filler and fill slowly as you run the engine from cold.

Your cooling system could be full of rust and scale. Did you drop the bottom hose to drain it? What was the stuff like that came out? Try a reverse flush with a hose for both the block and the radiator. Does the radiator look OEM? If so it is likely due for cleaning or replacement. While at the radiator shop get it pressure tested for leaks. Get a new radiator cap.

 

 

[MrStabby]

Check the temperature of the top and bottom hoses. If the top is hot and the bottom is not then the radiator needs a clean, which will probably cost ~$150.

[Samyr34]

Today I put in a triple core radiator, both bleed points bleed out with coolant, heater got abit hot. And temp sat in middle. Took it for a 20 min drive temp stayed fine until pulled into driveway. Rises till about 3/4 then we cracked off the top bleed screws again alittle air came out and temp dropped alittle but still sat just under 3/4. Definatetly a lot better than before but still rises slowly. Bleed with car jacked up plus coke bottle so done the right things 

[KiwiRS4T]

13 hours ago, Samyr34 said:

Today I put in a triple core radiator, both bleed points bleed out with coolant, heater got abit hot. And temp sat in middle. Took it for a 20 min drive temp stayed fine until pulled into driveway. Rises till about 3/4 then we cracked off the top bleed screws again alittle air came out and temp dropped alittle but still sat just under 3/4. Definatetly a lot better than before but still rises slowly. Bleed with car jacked up plus coke bottle so done the right things 

Is your stock gauge reading 3/4 or do you have an aftermarket gauge in which case what does it read in deg C ? Doesn't sound to me like its overheating now..

[MrStabby]

Heating up when stationary point to the fan. Is the fan clutch tired? Could be you had two problems and you've only fixed one.

[Samyr34]

On 11 August 2016 at 10:07 AM, KiwiRS4T said:

Is your stock gauge reading 3/4 or do you have an aftermarket gauge in which case what does it read in deg C ? Doesn't sound to me like its overheating now..

It's still a stock gauge. Doesn't tell me in deg c. It doesn't overheat for awhile I done about 5km of driving in traffic stayed about half way. As I got into the driveway slowly started to rise up again till 3/4. Top hose was hot but the bottom hose was luke warmish slightly hot if that makes sence, the heater was abit hotter but still not crash hot as what it should be, and now I got the big triple core radiator on it, new thermostat and new temp switch. Definatetly a lot better than the old radiator it would of just overheated in the driveway but it's got me puzzled 

[Samyr34]

On 13 August 2016 at 9:59 AM, MrStabby said:

Heating up when stationary point to the fan. Is the fan clutch tired? Could be you had two problems and you've only fixed one.

Any idea on how to properly test the fan. Whenever cars on seems to spin ok