high pressure release sound
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Cross-Country
Joined: Nov 2005
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From: Portsmouth, OH
high pressure release sound
My 89 f150 started making this weird sound on the way home from work this morning. I haven't been able to pin it down but it seems to come from the front or top of the engine. it sounds like a pressure cooker release and lasts for a second or so. Only does it on acceleration or steady throttle while maintaining speed. Doesn't happen at idle. It doesn't seem to lose power.
It's an 89 F150, 5.0 EFI, automatic, 4X4.
Any ideas?
It's an 89 F150, 5.0 EFI, automatic, 4X4.
Any ideas?
Thread Starter
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Cross-Country
Joined: Nov 2005
Posts: 95
Likes: 0
From: Portsmouth, OH
Hmmmm....now that you mention it, it only happens with the defogger/heater on. but watching the a/c clutch it never seems to dis-engage. (all moving parts always moving) even when the electrical connection disconnected.
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Joined: Sep 2005
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My truck made the same noise when I blew the gasket on the water outlet after changing the thermostat. If the truck is running any hotter then usual or you see any steam I would definitely look at the cooling system.
Blindlightguy
Blindlightguy
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