heating - Chevy Impala SS Forum
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post #1 of 20 (permalink) Old 01-23-2016, 07:53 AM Thread Starter
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heating

Hoi guys, the heater of my '91 Caprice doesn't get as warm as it used to be. Temperature of the car is normal. So what can be the cause?

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post #2 of 20 (permalink) Old 01-23-2016, 09:23 AM
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I suspect partial blockage inside the heater core. Many have back flushed their core,and found it helps....

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post #3 of 20 (permalink) Old 01-24-2016, 08:05 AM
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You'd be able to tell if the blower was not humming at full speed. Common to have rodents sneak in the cowl and take up residence, along with their nesting materials. Easy to drop the blower and clean if you suspect something there. But a clogged heater is first choice. Reading other guys' accounts it's important to keep hose pressure low.

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post #4 of 20 (permalink) Old 02-04-2016, 04:47 AM
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Here's a pic of the inside of my son's heater core from his 94 ... and he had a touch of heat.

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post #5 of 20 (permalink) Old 02-18-2016, 02:49 AM Thread Starter
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Thanks guys, I'm going to do the heater core flush first and I'm also going to replace the heater valve. Does anyone has a step-by-step how to flush the core?

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post #6 of 20 (permalink) Old 02-18-2016, 05:09 PM
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Quote:
Originally Posted by shudahadaV8 View Post
Here's a pic of the inside of my son's heater core from his 94 ... and he had a touch of heat.

"OMG" that looks like the worst sickness I have ever seen! How many more out there are like this? As I type I am replacing the heater core in my 96 due to ZERO heat, though I believe my issues is vacuum I still found a bunch of crap during the flush procedure. New engine, new water pump, new thermostat, hoses are mint and a new B Cool radiator. Removing the heater core I also took one of the end tanks off, quite rusty but no where near as bad as this one pictured.

Last edited by Deputy347K9; 02-18-2016 at 07:07 PM.
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post #7 of 20 (permalink) Old 02-18-2016, 05:23 PM
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No heat!

Like many Caprice/Impala owners the day has arrived that I have a heat issue with my car. Bit of background. A pristine 96 Impala that during the last 6 or 7 years I have replaced everything on this car. Engine, transmission, rear end, suspension, interior, glass, body and even a custom "B Cool" radiator built to accommodate the T56. I think my big problem is for the past 10 years or more the car has only been on the road during summer. Maybe 750 miles per year and only used the heat once that I recall.

It was shortly after the car was restored that I first noticed no heat. I think my issue is two fold, heater core and secondly a vacuum problem. When I turn the knob for heat I don't hear the door opening, I think I use to hear it? Secondly I drained everything yesterday and flushed the core, I did remove a lot of trash, disgusting. However, still no heat. Being I had a factory AC Delco heater core I thought "why not", so I tackled the job!

Being 65 years young, overweight and the body not wanting to be placed in weird positions the job is not that easy.

Removing the front passenger seat does make life so so so simple! Removing the tray that covers the heater core is another issue. Those two rear screws (5 & 6) will cause you to swear! You can't see them and if you have a fair sized hand you can't feel them! The only way I could see them is with the wife's small mirror. Who put them there? I used a 1/4" flex drive with a 7/32". Screws 1 through 4 are a breeze when laying on your back looking up.

I took a a couple of pictures so you would get an idea of what your getting into. With the use of a 1/4" flex driver the job will be much easier, don't get me wrong it still will cause you to sear a bit. The older you are the cramps will be worse. With the seat out I cover the entire passenger side floor with a couple of nice soft blankets. Feet up on the rear seat, body in the tray and looking up!
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Last edited by Deputy347K9; 02-19-2016 at 05:37 PM.
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post #8 of 20 (permalink) Old 02-18-2016, 05:29 PM
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Heater core cover

I have another picture that you might find helpful when you attack the job. You will notice the heater core that I am using is a NOS GM core. I was lucky to have this in my stock of goodies. The rear two screws will not go back in!!!
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Last edited by Deputy347K9; 02-18-2016 at 07:08 PM.
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post #9 of 20 (permalink) Old 02-18-2016, 07:19 PM
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Just came in for the evening, enough is enough! Last night I removed the passenger seat, sill trim and A post trim. Now that I am about done I did not have to remove the sill or A post trim, didn't even have to pull the carpet back.

Removing the seat and laying blankets over the studs is a priority. Made life so much easier, resting the feet on the rear seat and stretched out. A nice drop cord and the wife small mirror was also a big help in locating what I could not see.

The 1/4" flex drive is without question a must and much easier than using a swivel joint (at least I think so). There was nothing so tight that I could not remove it using the 1/4" flex drive, still had a regular 1/4" drive with me. A 1/4" 7/32" socket, small 1/4" extension could come in handy, Philips screwdriver, deep well 10 MM socket and a 10 MM wrench so to remove the firewall brace so you can remove the lower tray. I am thinking this is all you need for inside the car. I did attach the two under hood hoses.

My new NOS core is now in place, both retainers are also. I will not close the cockpit up until I test the car out, just in case I need to start chasing vacuum lines.

Tomorrow morning I will start by tightening down the hose clamps and adding fresh coolant. Will test drive and bleed. If no heat I will start another project.

I do hope this information and pictures might help someone out there. Remember do not change your heater core when children are around!

Larry
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post #10 of 20 (permalink) Old 02-18-2016, 11:55 PM
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Lots of ways to flush. Some use a garden hose, but be careful ... water pressure in a house hose can be 40-80 psi ... and that's NOT ok. I've always attached two long lines to the core (while in the car), filled it with water (and the hoses), set my compressor to 10 psi and blasted the water and cleaner (let it soak) through from both ends ... maybe 10 times till the water flows through easily. I hold my finger on the outlet side hose (switching back and forth) till just before I hit the compressor blast. But look back at the picture ... it didn't last long. My son's problem was rust scale inside the engine ... it just wouldn't stop building up.
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