Quote:
Originally Posted by lsmalley
Just replaced my heater valve and I noticed that when I have it set to cold it works fine, but when I come to a stop and accelerate again it blows hot air for about 10-15 seconds then cools again. I originally thought vacuum leak, but it only does it when accelerating from a stop. Any suggestions or things to check?
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Answer this question for me, does the defrost flap come open as well? I had a similar issue where the defrost flap was coming open part way sometimes even when I had it set to just the vents or feet, it ended up being a shot defrost pod. The way you can test the vacuum components in the HVAC system is to access the vacuum switchover unit that is behind the glovebox then use a vacuum tester to pull a vacuum and see if it holds.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.
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