Thread: Disco TDi 300 Coolant circulation

Originally Posted by rick130

It was a typo, I was bolting out the door, re-read the post now.

Block the bleed hole in the divider plate in the rad makes a difference, and taking the heater core out of circulation definitely made things run hotter.

Yes, I agree, theory says you'd need air passing over the core as in the heater baffle being open, but I can only report that the engine temps were definitely hotter without a heater core in place.

Fair enough, As stated in initial thread I have blocked the hole in the radiator baffle, managed to do that from the plug hole in top of the radiator. Also what I have done is restrict the the return flow from the heater to a 3/16 hole. results looking promising but not really tested yet. The heater still produces mildly warm air rather than hot.

Originally Posted by rick130

It was a typo, I was bolting out the door, re-read the post now.

Block the bleed hole in the divider plate in the rad makes a difference, and taking the heater core out of circulation definitely made things run hotter.

Yes, I agree, theory says you'd need air passing over the core as in the heater baffle being open, but I can only report that the engine temps were definitely hotter without a heater core in place.

Just had a thought, without a heater core in place there would be very little resistance to flow, the result would be more coolant than normal going via the heater hoses & less to the radiator. Im assuming you just had the heater hoses bridged .

Originally Posted by Silverone

Just had a thought, without a heater core in place there would be very little resistance to flow, the result would be more coolant than normal going via the heater hoses & less to the radiator. Im assuming you just had the heater hoses bridged .

Yeah, I thought about that too, although there's eff all restriction through the heater core, they flow pretty well.

BTW, I missed that you'd already blocked the bleed in the divider plate. Curious how you did it through the top bleed plug hole ?

Originally Posted by rick130

Yeah, I thought about that too, although there's eff all restriction through the heater core, they flow pretty well.

BTW, I missed that you'd already blocked the bleed in the divider plate. Curious how you did it through the top bleed plug hole ?

I wrote a very detailed description of how I done it but went to post it & I had been log out.
So a short version. A bronze welding rod attached to a heavly modified 1/2 brass bolt which is held in place by a small spring under the brass bleed plug The holie in the baffle is 1/2.