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Old 07-25-2012, 04:43 PM
Schurkey Schurkey is offline
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Re: 88 Silverado Heater gone bad.

Quote:
Originally Posted by bigwoody555 View Post
My `88 K1500 is leakin at the heater core also. Is this a hard fix?
It is if you're going to replace all the shitty, degraded foam seals so the HVAC actually works right again.

I had a shop replace my heater core (I thought it was plugged.) Made no difference in the interior warmth because of the enormous cold-air leak at the cowl-to-heater box seal, as detailed in my post above.

Replacing the core fixes your coolant leak. Replacing the foam (and verifying that the actuators work properly) makes the air go where it needs to.

If the core has rotted out, be sure to flush the old coolant. Would be worth your time to verify coolant voltage afterwards, too.
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