Question about 1991 Chevrolet C1500

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Had my truck in shop for 2 days, came out and had no heat. the temp gauge is running normalish, goes up then down then levels out.hoses going to heater core, the one feeding in is hot, the other is cold.there is some heat but verry little. coolant level is good.

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Well may be your heater core plugged.I could not find a part for a mixing valve.The older models had them in the feed line and were vacume or cable controled,some later models had them inside but would think that were the hoses connect go directly to the heater core.You may want to install some flushing T's and clamp off both hoses at the block and try reverse flushing the core and see what if anything comes out.

Posted on Feb 05, 2010

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Heater core is pluged have it flushed and it will work good after that.

Posted on Feb 05, 2010

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1 Answer

THe heat gauge will get to appropriate temp and when heat I see turned on you will get heat for about 30 seconds at which point the temp gauge goes down and you only get slightly warm air.


First check the coolant level. May be low. If not check your thermostat. Could be stuck open in which case will let the vehicle run cooler.

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This is a sign that the thermostat is sticking shut and then opening after the temp gets past a certain point. If the heat gauge goes to high and then drops down suddenly, this is the likely culprit and you need to replace the thermostat - again.

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I would flush the heater core out:

open the hood and look on the firewall. There should be 2 rubber hoses going into the firewall and into the truck. If factory they will have spring clamps just like on the radiator hose. Remove both lines. Then get a hose and put it in one line and run the water until it comes out clear. Then do the same thing with the other side. Do this a couple of times. Then reconnect the 2 hoses and check the level of the radiator. Then start the car with the radiator cap off and wait a while for the thermostat to open and have the heater on so it will cycle through the whole system. Then top off as needed. This should fix your problem Tim

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It sounds like there is a leak of some sort. (hose, freeze plug, water pump, blown head gasket, etc.) The coolant level is probably low. You need to check it ASAP! Check the coolant level and if it is low you need to find out why and get it repaired...You DON'T want to overheat that engine! Especially if you have the 3.0L V-6. It only has to overheat once to do some serious engine damage.

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You have air in the cooling system, it needs bleeding, this is best done from the heater hoses. you cannot have a heating or cooling sysem that is not pressurised. no water no heater no demister no temp guage

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