Question about 1988 Chevrolet K1500

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Hot coolant not getting to Heater Core.

I think the previous owner messed up the plumbing in the engine cooling system. I would like to find a diagram of the cooling systems piping for an '88 Chevy K-1500 V8 350 4x4

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Some 88 chevy hawe valve on top of intacke manifeld and operate on vacum shot of valve for heat,aplay vakum on and se if working.yu hawe to tach both hoses wat going in to heater box mast be hot ven engine runing,if are not hot problem heater core

Posted on Mar 13, 2009

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Posted on Jan 02, 2017

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Low coolant, if there is an air pocket in the engine it will make it to the heater core. Once there , the air coming out is cold/cool. Once the coolant fills the heater core, it gets hot. If the coolant is fine hot or cold, then have the HVAC system scanned.

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There a a couple of possibilities

1. The thermostat is stuck open. This can usually be veried by looking at the temp gauge. If it is not about half when after the engine has had enough time to fully warm up than I would suspect a bad thermostat.

2. the coolant level is too low. The highest point in the cooling system is the heater core. If the coolant level falls to low the heater core will not get enough hot coolant to function properly.

3, the heater core is plugged. Proper cooling system maintenance will remove much of the debris that ends up in the cooling system. If this service has been neglected this debris will settle in the heater core. Over time it will build up to the point that hot coolant can not flow through the entire heater core resulting in less than adequate or no heat.

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Try this link for a free manual:-
http://safemanuals.com/user-guide-instructions-owner-manual/OLDSMOBILE/ACHIEVA%201998-_E

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