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Registered
Join Date: Jul 2005
Location: Canada
Posts: 254
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Heater Valve: Car off, does it default to open?
OK, here's a question, when the car is not running, is the vacuum operated heater valve in the open position or closed?
I picked up a Stant cooling system pressure tester (amazing tool by the way) and when I use it to bleed the system, I want to be sure I'm getting to the heater core as well. Thanks guys. |
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02-15-2011, 06:36 PM
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Join Date: Jan 2005
Location: In a dumpster behind Albertson's in Los Angeles County
Posts: 2,132
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You need the car running and at operting temp to properly bleed the cooling system. I also helps to raise the front of the car a bit when doing the bleed. Heater valve must be OPEN when bleeding.
If you don't have the car running and at operating temp you will not get all the air out of the system. There is a pocket in the back of the head that traps air, and if not properly bled, you will end up with a "hot spot" and ultimately a blown head gasket. Proper bleeding of the system is another one of the "MUST DO" things on these cars, just like timely timing/balance belt replacement.
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1989 944 NA Glacier Blue - SOLD IT 1989 944 S2 Alpine White T-Boned (totaled) by a lady dressed in a CLOWN costume (RIP  ) Apr 89 - Mar 081988 944 Turbo S Silver Rose Metallic, K27/6, Vitesse MAF, Tial 38mm DP WG Semper Fi |
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02-16-2011, 07:02 PM
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Join Date: Jul 2005
Location: Canada
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Under the hood is in pieces, I've just built up the coolant system with all new hoses and want to check for leaks before I assemble much more. Its easy to get to the hoses now if I need to tighten or adjust. I'll do a full nose up hot bleed in the spring.
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02-17-2011, 05:22 PM
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Registered
Join Date: Sep 2008
Location: Atlanta area
Posts: 445
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I'm pretty sure the valve is open if there is no vacuum to it. With the car off, the coolant should go through the valve, not sure about the heater core ( exchanger) though. I would suspect that it does.
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Bruce P. 2011 Cayman Base, LSD, Sport Chrono. 1988 951 totaled and missed "You're the best I ever had" --JJ Cale |
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02-18-2011, 09:11 PM
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Registered
Join Date: Jul 2005
Location: Canada
Posts: 254
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Quote:
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1987 951 ROW |
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02-22-2011, 07:39 AM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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Quote:
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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03-05-2011, 05:59 AM
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1988 Porsche 944 Turbo S Limited Edition
