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Coolant overflow/recovery tank
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TOPIC: Coolant overflow/recovery tank

Coolant overflow/recovery tank 5 years, 10 months ago #2385

  • Kummo
  • OFFLINE
  • Senior Boarder
  • 2010 DRZ400E
  • Posts: 49
Hi Guys,

I have a question, What could be the problem when the coolant does not suck back into the rads when the bike cools down. My overflow tank is nearly full and I have to keep topping up rad. It used to be OK, I did have to dump and replace the coolant due to twisting a rad (see other thread). I have only just noticed the tank filling up and not sucking back in. What do you guys recon? any help is appreciated.

Cheers,

Kummo

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2386

  • drztroy
  • OFFLINE
  • Gold Boarder
  • Posts: 294
check to see if the return line is kinked or blocked

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2389

  • Kummo
  • OFFLINE
  • Senior Boarder
  • 2010 DRZ400E
  • Posts: 49
Yeah all hoses look fine. The bike has only done under 800ks. Any one else? I am thinking I might drain and refill. On thumper talk they say there are two bleeder screws one on non fill rad and one on water neck, I can't find that one. Maybe not there on late model zed's?

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2391

  • Buddy
  • OFFLINE
  • Senior Boarder
  • Posts: 27
my thoughts are maybe theres a pin hole in the radiator which closes up when hot and opens when it cools allowing air to get back into the system.

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2394

  • 77
  • OFFLINE
  • Fresh Boarder
  • Posts: 9
Is the breather hose also clear? It could be that air can be forced out through breather by the force of expanding coolant but not allow air to travel back the other way when coolant returns to radiators. How full does the expansion tank get?

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2395

  • Kummo
  • OFFLINE
  • Senior Boarder
  • 2010 DRZ400E
  • Posts: 49
It's been slowly filling up over the last couple of rides, maybe 3/4 full now. I'll check the breather hose.

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2396

  • wayno
  • OFFLINE
  • Platinum Boarder
  • Posts: 421
Doesn't the radiator cap work under the presure built up from the heat ? (im not really sure myself) anyway if it actually does , perhaps its not allowing the coolant to return.. The over flow tube is right up high ,positioned at about the middle of the cap , so when the coolant returns it has to pass the bottom half of the cap... I have never had coolant in the over flow tank , i know its been talked about here before ( half full, or quarter full) but niether the motard or the S model had a drop in them when i purchased them brand new ??

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2398

  • Kummo
  • OFFLINE
  • Senior Boarder
  • 2010 DRZ400E
  • Posts: 49
Breather hose is clear. Pump air into it and level in over flow drops. When I took cap of I played with the spring worked it a couple of times, seams good. I will take it for a ride tomorrow and see what happens.

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2399

  • Owey
  • OFFLINE
  • Expert Boarder
  • Posts: 59
I think that it is a dodgy cap, therefor not letting the coolant back in. Also check the air bleeding screw to make sure it is seating prpoerly.

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2431

I have the same trouble with mine I kept topping up the radiator at the cap and it would overlow.

I found that when the bike heats up the fuid that goes into the overflow tank is what comes out due to expansion. If I dont touch anything the level just stays there.... All it is doing is just not returning to the radiator.

Re: Coolant overflow/recovery tank 5 years, 10 months ago #2434

  • Kummo
  • OFFLINE
  • Senior Boarder
  • 2010 DRZ400E
  • Posts: 49
Yeah exact same problem. I spoke to the dealer where I bought it from and I suggested the rad cap and he said he has not heard of the caps failing so early, my bike has less than 800k's on the clock.

He said it sounds like an air lock in the system. I don't recon but I am going to flush it and put engine ice in it anyway. He told me to make sure to lean the bike over both sides to let air out.

The only drama I have is emptying the overflow bottle itself I can get the clip off but no room to pull hose off because off no room and sleeve on the hose. Any ideas?
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