Author Topic: Heater Delete Question (Read 3451 times)

ClayW · « **on:** May 29, 2011, 09:19:45 PM »

Has anyone deleted the heater in their M42 car? If so, did you loop the heater feed to the heater return, or just cap each one off?

Please share your experiences.

Thanks in advance.

DesktopDave · « **Reply #1 on:** May 29, 2011, 09:30:38 PM »

I looped my old VW like 20 years ago...heater core popped & left me stranded.

monty23psk · « **Reply #2 on:** May 29, 2011, 09:39:08 PM »

I have seen both ways. It is just pref. The caps are easier but overtime should be replaced as they get brittle. The hose loop is getting the right size and lenth. Since you have it in the 1600, the loop itself might take up more space than you want.

M5wanaB · « **Reply #3 on:** May 29, 2011, 11:13:50 PM »

Got mine looped with a couple of random heater hoses I had lying around and a plastic barbed elbow from Home Depot

ClayW · « **Reply #4 on:** May 30, 2011, 02:55:16 PM »

Quote from: M5wanaB;104154

Got mine looped with a couple of random heater hoses I had lying around and a plastic barbed elbow from Home Depot

Hmmmm. I am working on a theory that looping the heater lines feeds superhot coolant right back into the block.

bmwman91 · « **Reply #5 on:** May 30, 2011, 04:08:22 PM »

Looping will put a little more hot water through the radiator. It likely isn't a big deal though.

Are you preparing a race car? Lots of people delete AC, but I can't say I have heard of too many people deleting heat!

ClayW · « **Reply #6 on:** May 30, 2011, 05:20:52 PM »

Quote from: bmwman91;104177

Looping will put a little more hot water through the radiator. It likely isn't a big deal though.

Are you preparing a race car? Lots of people delete AC, but I can't say I have heard of too many people deleting heat!

No, I'm just running an M42 in a `67 1600. I've had some teething issues with overheating. So far, I've got a new radiator, water pump and thermostat. The thinking was that my looping the heater hoses might have been causing a problem (I'm going to install a new universal HVAC unit inside later). The theory was that the heater feed was coming right off of the head and I was dumping it back into the block circulation, whereas the coolant from the heater would normally either be blocked by a heater valve or cooled by the heater.

Just a thought.

bmwman91 · « **Reply #7 on:** May 30, 2011, 08:28:30 PM »

Hmm, it seems unlikely that looping it like that would cause severe overheating issues. When your temperature dial is turned to "cold" the heater core is basically blocked off & dissipating minimal heat (it gets HOT, but no air is blowing by to take that heat away, so the hot coolant basically passes through unabated). Looping things shouldn't make a difference. Besides, the hot water returning from the heater core feeds more or less back to the water pump & it'll go right through the radiator if it is hot enough to open the thermostat.

You could always try plugging the heater core hose ends just to see if it makes a difference.

If I had to guess, I'd say that there's an air bubble trapped by the temp sender. How hot does the gauge read, and how does it behave at start / within the first 5 minutes of running? When you filled the system, how much coolant did it take & how did you bleed it? Did you make sure to clear the little bypass groove in the thermostat housing?

M5wanaB · « **Reply #8 on:** May 30, 2011, 08:47:05 PM »

I have had mine like this for months and have had no overheating issues.

rac3r · « **Reply #9 on:** June 04, 2011, 03:58:43 PM »

I looped mine about a year ago and have had no issues beyond freezing my @#$ off in the wintertime.