Has anyone bypassed the heater control valve?
#1
Racer
Thread Starter
Has anyone bypassed the heater control valve?
Okay, I don't need hot air coming into the cabin. I closed off the control valve already, but is there anyway to just reroute it. I've done this in a gti before, which was quite simple, the in and the out were right next to each other. Has anyone ever done this? Any photos or ideas. Thanks.
#2
Rennlist Member
On my GTS I removed the vacuum pod and zip tied it shut. Is that what you meant? Don't forget to plug the vacuum line.
#3
Chronic Tool Dropper
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Connecting the two hoses means some of your coolant is bypassing the radiator. If you want to completely isolate the heater core, just plug both lines going to it. You can zip-tie the existing HCV so it stays closed. There are undoubtedly manual shutoff valves that can be put in the return hose to the pipe under the reservoir, so heat doesn't migrate back through the return to the heater core again, if you feel the need.
#4
Nordschleife Master
Correction:
Below is the correct 3/4 " manual heater control valve with petcock.
Cross referenced by JPTL here: https://rennlist.com/forums/8521033-post16.html
New NAPA part number here
http://www.napaonline.com/Catalog/Ca...101_0385514314
Below is the correct 3/4 " manual heater control valve with petcock.
Cross referenced by JPTL here: https://rennlist.com/forums/8521033-post16.html
New NAPA part number here
http://www.napaonline.com/Catalog/Ca...101_0385514314
Last edited by UncleMaz; 05-24-2013 at 09:17 PM. Reason: correct part
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#8
Chronic Tool Dropper
Lifetime Rennlist
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Lifetime Rennlist
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#9
Rennlist Member
All you have to do is plug the return line. Unclamp the return line under the plastic cover near the windshield wipers, driver's side, and insert a plug, then reclamp in place. This was done to my 89 by the PO and I had no hot air. I had to cut a couple of inches off the hose to reverse this.
#10
Rennlist Member
Very cool, haven't seen that solution before. Couldn't that be wired to the circuit that opens the vacuum valve at the vacuum manifold?
#11
Rennlist Member
here is the thread that shows the petcock valve solution. I used it and works well in cental Texas where we don't have allot of cold weather. Got mine at O Riellys. I pulled the heater valave and inserted the petcock in its place. I capped the vacuum line.
others have inserted the petcock into the line along the bulk head so during the winter they open the petcock and have normal heater valve function but can be completely blocked off during the summer.
https://rennlist.com/forums/928-foru...l-valve-2.html
others have inserted the petcock into the line along the bulk head so during the winter they open the petcock and have normal heater valve function but can be completely blocked off during the summer.
https://rennlist.com/forums/928-foru...l-valve-2.html
#12
Racer
Thread Starter
I have zip tied the valve shut, but heat still comes through the cabin vents. If I replace the valve, and heat still comes through. What would be my next step? Thank you all for your input....
#13
Instructor
I also use the petcock idea, and it works great. you can get the part at Napa as well. Just tie it into the line and in the winter and close off in the summer. Works great
I believe the threads her have all the details if you like this approach and would still like to have A/C occasionally.
I believe the threads her have all the details if you like this approach and would still like to have A/C occasionally.
#14
Nordschleife Master
Connect the valve to manifold vacuum. Put a "T" in below the vacuum one-way valve and run a hose from it to the hot water valve. Plug the old line. Done and done for about $4.
#15
Three Wheelin'
.............Couldn't that be wired to the circuit that opens the vacuum valve at the vacuum manifold? ....
Sure but running 2 wires from the switch was so easy.
Sure but running 2 wires from the switch was so easy.