Question about 1991 GMC K2500
I have seen this many times before. The sound is air being forced out of the radiator cap and escaping back into the coolant recovery bottle. It can be as simple as a new radiator cap or as costly as cylinder head crack, or even block cracked. It is important that your radiator be completely full with proper coolant mix and have a good working order cap with the proper pressure.
Posted on Jan 15, 2009
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