Question about 1995 Chevrolet Caprice Classic

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Were do i hook up my other hoses for my heater core

I have a 91 chevy caprice and i got one hooked up to my water pump but dont know were the other one go

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  • zekers May 11, 2010

    please be more specific, hoses for what?

  • tony batson May 11, 2010

    what size is the hose

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  • Master
  • 962 Answers

From the radiator ? If that is the case, the other one goes to the thermostat housing outlet.

Posted on Feb 17, 2009

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1 Answer

I swap out the heater core and may hav installed the hoses wrong.I hooked up the hose from water pump to lower fitting and return hose on top fitting


It usually doesn't matter-it just circulates coolant through the core and returns it. But the hose going to the water pump is the return hose from the core. The other hose from the cylinder head or intake manifold is where the coolant comes from and going to the heater core. Take off the hose at the water pump and you will see a stream coming out with the engine running and the heater control on hot. Try this and if the stream is not good, try swapping the hoses at the core- I mean take the hose to water pump and fit it to the core's upper hose, and the inlet hose to the lower fitting. It shouldn't matter, but let us know.

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What heater core hose goes in what hook up


Should not make any difference as long as the hoses are the same inside diameter. one hose is input and the other is output. Should not make any difference which way the water flows thru the heater core.

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does not matter which goes where on the heater core one from water pump straight to heater core and the other comes from the intake manifold, they both travel below the passenger side valve cover.

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Heater doesnt work blows cold air, replaced thermostat and flushed heater hoses appears to have no flow through heater core, but lines arent plugged on a 1995 gmc sonoma. Why is the hot air not flowing...


This is what I did to solve the exact same problem.I got a pump that you can hook to a drill that has garden hose connections on it.I made 2 hoses to pump into my heater core and hook to the pump. I bought some radiator cleaner at Auto Zone and put it in a 5 gallon pail with about 2 gallons of hot water.I pumped the cleaner from the pail into the OUTLET side of the heater core.(By going in the outlet side you are back flushing the core.) I put an old cloth over the top of the bucket and let the outcoming cleaner run onto this cloth acting as a filter for the dirt coming out of the heater core and let the pump run about 10 minutes. Believe me,A LOT!!!!!!!!!!! of dirt,rust etc. came out of my heater core. The heat now works excellent! Good luck.

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No heat in my dakota. flushed heater core and replaced therm with a reg one.


check for poor flow to heater core-change heater hoses -check for lime build up at intake connector or worn out water pump -if you only put water through core try using CLRlime cleaner in core-get two 6in pieces or heater hose hook them to core and pour it in and leave for 15 mins then wash out with water hose

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I need the wiring diagram for the stock stereo on the 91 caprice


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I need to know where the hoses go from the heater core?


Have had the same problem with a Corsica.The reason they bypassed the heater core is that it had a hole in it.Reccomend filling with water prior to hooking up hoses.

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I own a 200 Chevrolet Blazer and I have it for over 4 years mine does the same thing I actually just noticed my heat getting less. My husband found the best way to fix it and the cheapest way to fix it. He takes the tube off the heater and attaches a water hose to it and flushes out the gunk whatever is blocking the hose and after he does that the heat works great. No cost and if I wanted to I could do it because its so easy. My husband did some searching on the internet and a person that this happens all the time to let me husband know. If you need more info let me know I can ask my husband he isn't home at the moment I so I don't have exact details. Thanks Amy

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Low heat from my 2001 Passat heater


There are known problems with this vehicle's heater core not getting enough coolant flowing through it to blow hot air.
1) Even if the coolant looks good, there are problems with the heater core plugging up. One solution is to use a heavy duty cleaner (CLR pipe cleaner) to back flush the heater core. To know if the heater core is plugged up, disconnect the 2 heater hoses at the heater core and somehow connect a hose to one end of the core. Try to flow water through, it doesn't have to be high pressure, and there should be a steady stream. If not, try to get the cleaner directly into the heater core and let it soak. Then back flush it and a lot of scale should be seen coming out.

2) The other problem is that since the heater core is the highest point in the cooling system air tends to get trapped in it. This should only happen if the coolant goes low or someone has opened the system to service it. There are a number of ways to bleed the system (vacuum bleed, pressure bleed). One of the hoses should have a small hole in it for bleeding air, pull that hose back just enough so the hole allows coolant to flow out of it. Then accelerate the engine and get a good flow coming out, when no more air bubbles are present, there should be good heat.

3)I've heard of bad water pumps with low flow causing issues as well as an aux. water pump not fuctioning correctly leading to poor heat output from the heater core. Someone should confirm this as I cannot get much information on the aux water pump(electronic pump by the alternator that is supposed to run after the car is shut off).

Hope this helps.

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