 heat delete fan outlets, Should I cap them? |
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| mobymutt |
 May 19 2018, 10:02 AM
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#1
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Senior Member  Group: Members Posts: 548 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada  |
I currently don't have any of the heater stuff on my car, although I still have the stock HE's.
Should I be capping off the outlets on the engine cooling fan housing? If so, what specifically can I use for caps? I did a search, but couldn't find much. I would think this would be a pretty common question. |
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| mepstein |
May 19 2018, 10:15 AM
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#2
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914-6 GT in waiting Group: Members Posts: 19,220 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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It’s a good idea to cover the holes in the engine tin and use rattle can paint caps to cover the holes that lead into the longs. It’s not nessesary to cap the electric fan.
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| SirAndy |
May 19 2018, 10:45 AM
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#3
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Resident German Group: Admin Posts: 41,602 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(mepstein @ May 19 2018, 09:15 AM)  It’s a good idea to cover the holes in the engine tin (IMG:style_emoticons/default/agree.gif) The smell of dead mice will last for weeks. Ask me how i know ... (IMG:style_emoticons/default/icon8.gif) |
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| mobymutt |
May 19 2018, 11:51 AM
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#4
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Senior Member Group: Members Posts: 548 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada |
It's the two outlets on the fan shroud that I was concerned about the most, as it seems like most of the air would just go out there instead of over the engine.
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| GeorgeRud |
May 19 2018, 03:22 PM
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#5
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
As air is always going to flow along the easiest route, I think capping those outlets would be wisest. Then the air is all forced over the engine (which is a good thing).
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| barefoot |
May 20 2018, 06:40 AM
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#6
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Senior Member Group: Members Posts: 1,268 Joined: 19-March 13 From: Charleston SC Member No.: 15,673 Region Association: South East States
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When I got mine it was a heat delete conversion and they'd made some aluminum caps held on with SS hose clamps to cover those 2 outlets.
I've now converted back to full heat OEM config. |
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| bdstone914 |
May 20 2018, 08:35 AM
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#7
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bdstone914 Group: Members Posts: 4,508 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
QUOTE(GeorgeRud @ May 19 2018, 02:22 PM) As air is always going to flow along the easiest route, I think capping those outlets would be wisest. Then the air is all forced over the engine (which is a good thing). That would seem logical but consider that the fan housing outlets were designed to have air flow at all times to have air flow through the heat exchangers. I think Jake Raby found the air flow is better if the fan housing outlets are left open. Capping them off can disrupt the air flow in the shroud by having two dead ended outlets. I would run an oil temp gauge and check the difference. Bruce |
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| GeorgeRud |
May 20 2018, 09:20 AM
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#8
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
Please report your findings running them open or capped. It would be good to know, but I’d trust Jake Raby’s advice. If the car isn’t overheating with them open, it really shouldn’t be an issue.
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| mobymutt |
May 20 2018, 09:28 AM
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#9
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Senior Member Group: Members Posts: 548 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada |
QUOTE(bdstone914 @ May 20 2018, 10:35 AM) QUOTE(GeorgeRud @ May 19 2018, 02:22 PM) As air is always going to flow along the easiest route, I think capping those outlets would be wisest. Then the air is all forced over the engine (which is a good thing). That would seem logical but consider that the fan housing outlets were designed to have air flow at all times to have air flow through the heat exchangers. I think Jake Raby found the air flow is better if the fan housing outlets are left open. Capping them off can disrupt the air flow in the shroud by having two dead ended outlets. I would run an oil temp gauge and check the difference. Bruce I've never had any of the heater tubes/fan/valves in my car, so I'm not really clear on the OEM configuration. If you aren't actively blowing heat into your car, aren't the outlets just dead-ended further downstream anyway? At those flapper valves or whatever they are called? |
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| mobymutt |
May 20 2018, 09:33 AM
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#10
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Senior Member Group: Members Posts: 548 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada |
QUOTE(GeorgeRud @ May 20 2018, 11:20 AM) Please report your findings running them open or capped. It would be good to know, but I’d trust Jake Raby’s advice. If the car isn’t overheating with them open, it really shouldn’t be an issue. Unfortunately, I don't have enough historical data to provide good findings. I've basically driven my once for an extended period, and the oil temp just kept climbing. BUT... I also have no engine tin seals, I've got uncapped holes everywhere in my engine tin, my thermostat isn't hooked up. So I want to drop my engine again soon, and try to get all those issues resolved at once. |
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| mobymutt |
May 20 2018, 09:34 AM
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#11
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Senior Member Group: Members Posts: 548 Joined: 16-December 13 From: Kingston, Ontario, Canada Member No.: 16,770 Region Association: Canada |
QUOTE(barefoot @ May 20 2018, 08:40 AM) When I got mine it was a heat delete conversion and they'd made some aluminum caps held on with SS hose clamps to cover those 2 outlets. I've now converted back to full heat OEM config. Sounds like a good idea. I will give that a go. |
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| Bartlett 914 |
May 20 2018, 10:11 AM
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#12
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Advanced Member Group: Members Posts: 2,214 Joined: 30-August 05 From: South Elgin IL Member No.: 4,707 Region Association: Upper MidWest |
QUOTE(mobymutt @ May 20 2018, 10:28 AM) QUOTE(bdstone914 @ May 20 2018, 10:35 AM) QUOTE(GeorgeRud @ May 19 2018, 02:22 PM) As air is always going to flow along the easiest route, I think capping those outlets would be wisest. Then the air is all forced over the engine (which is a good thing). That would seem logical but consider that the fan housing outlets were designed to have air flow at all times to have air flow through the heat exchangers. I think Jake Raby found the air flow is better if the fan housing outlets are left open. Capping them off can disrupt the air flow in the shroud by having two dead ended outlets. I would run an oil temp gauge and check the difference. Bruce I've never had any of the heater tubes/fan/valves in my car, so I'm not really clear on the OEM configuration. If you aren't actively blowing heat into your car, aren't the outlets just dead-ended further downstream anyway? At those flapper valves or whatever they are called? If there is nothing connected then Cap them off. In a functioning system and the heat for the cabin is off, the air will go through the heat exchangers and exit through a cap on the flapper valve |
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