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Old 10-20-2011, 05:34 PM   #1
57 3100
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heater hose question

guys,
i want to put the heater hoses back on my 1990 K-1500 4x4 5.7 truck.
does it matter which hose i put on which nipple on the firewall ?
one hose comes from the rear of the intake manifold and the other comes from the radiator.
thanks guys
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Old 10-23-2011, 09:16 PM   #2
scotts62
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Re: heater hose question

Dont really think it matters, i have always done the top one to the manifold but im not sure why
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Old 10-26-2011, 10:48 PM   #3
Hoods69BadBowTie
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Re: heater hose question

Yea on my '88 the top one goes to the intake manifold and the bottom one goes to the top on the radiator. Pretty sure the '91 I have is the same way as well.
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Old 10-27-2011, 04:28 AM   #4
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Re: heater hose question

thanks guys.... my nipples from the firewall are side by side. i found out the smaller diameter, 5/8 hose goes from the radiator to the left 5/8 nipple, and the 3/4 hose from the right nipple to the intake.
thanks again
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