Overheating M35

[Thejackal98]

What's your coolant mod ? I'll bleed again today I'll see how I go. Thanks scotty hope it works there beautiful car

[Daleo]

Prior to the Cooling mod; I used to use a long tapered funnel that adapts to a PET bottle.
It's a plant watering spike that you use in the garden; bought from Bunnings for about $4.


This was narrow enough to fit in the bleed point, and gave a nice bit of extra head height to allow for coolant expansion and exhausting of air, whilst not allowing more air back into the system..

[Thejackal98]

Thanks daleo did you do this when car was just idling? I'm gonna do it when I get home from work then drive for a bit see how it goes.

I'll keep use posted it must be that surely bit gasket cause shows no symptoms whatsoever I could imagine doing a gasket on the vq would be a pain.

Thanks mate.

[Daleo]

Thanks daleo did you do this when car was just idling? I'm gonna do it when I get home from work then drive for a bit see how it goes.

I'll keep use posted it must be that surely bit gasket cause shows no symptoms whatsoever I could imagine doing a gasket on the vq would be a pain.

Thanks mate.

I normally hold rpm at about 2000rpm for 10 second bursts, to speed coolant flow through the system, that pushes any trapped air to the high point.

Done a couple of times and it will push most of the air out. Once cool, you can top up at the bleed point using a syringe and some plastic tube. You may need to do it a couple of times.

Scotty's coolant mod just makes flushing and bleeding the system so much easier.

Also allows the cooling system temperatures stabilise much moremore quickly, & efficiently.

Highly recommended.

[LenBo]

I normally hold rpm at about 2000rpm for 10 second bursts, to speed coolant flow through the system, that pushes any trapped air to the high point.

Done a couple of times and it will push most of the air out. Once cool, you can top up at the bleed point using a syringe and some plastic tube. You may need to do it a couple of times.

Scotty's coolant mod just makes flushing and bleeding the system so much easier.

Also allows the cooling system temperatures stabilise much moremore quickly, & efficiently.

Highly recommended.

Can you add another to the list of cooling mods Scotty? top tank of my radiator has just cracked and squirted all of the coolant out. I've fibreglassed a a temporary patch on the crack and will order a new radiator ASAP. After patching, I haven't yet got the car running without overheating in about 2km's. After reading this thread I'll put some effort into bleeding as advised. This all makes the coolant mod sound essential (anything to make this overheating situation better). I figure I might as well take this opportunity to improve the radiator. Any recommendations for superior radiator? I live in Qld - so 38 degs is common an have some mods (hopefully few more in the future).

[scotty nm35]

I just finished making one for Beau, If you want a kit, send me a pm, I can send some pictures if you like and explain it's operation Lenny.

There are a few options for radiators, plastic tank and alloy, but they are all to suit the V35 and will require a few small modifications to fit.

[LenBo]

Please! will PM you.

As for radiators. I'm pretty keen to upgrade. Even before having the top tank crack, the cooling system just didn't seem to keep up. Every time I'd drive up the toowoomba range the temp would climb. very hot days with AC on also seemed to be a challenge. That said, if the cooling system is the limiting factor as opposed to the radiator, then maybe a standard rad will do the job with the cooling mod. thoughts please?

A few mods is fine, I've already added 600mm HKS type S intercooler (from an evo that I made to fit) so have a non standard slim AC fan, 3" suction pipe (inspired by your suction pipe mod thread, boy that was a challenge) and just finished the 3" dump and exhaust, which came out really nice and quite in the end.

[scotty nm35]

The standard rad is only 15mm or so, the aftermarket plastic tank rads are 30 odd. They should be more than up to the task, as long as the engine is bled properly.

The VQ is a pain to bleed, and losing 1 cup of coolant is enough to overheat the engine. With my coolant mod it becomes much quicker to bleed, and you can still drive the car home after losing 2-3L. (as I found out after the last Sandown track day)

[PN-Mad]

I've got a mishimoto rad in mine, two pass, alloy unit. It required modification to mounting points to fit, but boy I'm happy with it. When the car is moving and I've had the laptop plugged into it, even on a hot day(40 degrees) AC on, it sat at 88 degrees. Even on the track, it came in after a session without using the thermo fans (so <93 degrees).

It's a bit of a pita to fit, but worth it IMO. I also have the nismo thermostat and Scotty's coolant mod. Gearbox cooler is purely external as well.