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Old 07-03-2020, 11:16 AM   #26
MistrThou
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Have you checked vacuum/pressure in the blend door lines at highway speeds. Just because you have good vacuum at idle doesn't mean it won't leak out when cruising. A one way valve will let it go to 0 if there's a leak and you're cruising in boost or near 0 vacuum.
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Old 07-03-2020, 06:24 PM   #27
TimS
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It was hard to do while driving. I did check when I was under there that I could cycle the door open and closed. Car off.
remove and check the white vacuum bubble tank under the heater for leaks. It turned out the rubber connectors / reducers were leaking. I ended up zip tieing them to seal them. Are they available?
I searched but the pics didn't look right.

Last edited by TimS; 07-03-2020 at 06:30 PM..
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Old 07-03-2020, 07:19 PM   #28
jjona5
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I use wood clamps to clamp off the heater hose lines to test for temp drop. My 93 got almost 10 degrees cooler when I replaced the heater valve with one of the dave setups. Couldnt tell it was leaking before I clamped it manually.
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Old 07-03-2020, 09:19 PM   #29
90volvo
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Quote:
Originally Posted by jjona5 View Post
I use wood clamps to clamp off the heater hose lines to test for temp drop. My 93 got almost 10 degrees cooler when I replaced the heater valve with one of the dave setups. Couldnt tell it was leaking before I clamped it manually.
That’s good info right there. I always wondered if it would make a difference. My sons 93 is impossible to get cold when last year it was working well.
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