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7/18/16 9:28pm - Original Message: 'Running hot, blower issues?'
buxton161
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Scarborough, MA - USA

Vette(s):
78 Corvette stingray

Joined: 5/30/2016
Posts: 30
78 runs extremely hot. Was told the blower may not be working?

How can I check this myself, and I am not seeing any blower?

On a side note, heat and ac do not work as well.

Thank you in advance.
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7/22/16 6:16pm - Reply: 'Re: Running hot, blower issues?'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Runs hot as in engine water temp hot or just hot inside?

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7/22/16 6:33pm - Reply: 'Re: Running hot, blower issues?'
buxton161
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Scarborough, MA - USA

Vette(s):
78 Corvette stingray

Joined: 5/30/2016
Posts: 30
Both actually, engine gets super hot within minutes And the inside gets hot as well. Attempted to use Ac Pro product then learned I need r12 instead since it's a 78 Going to get some from eBay to at least help with the inside
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7/22/16 6:44pm - Reply: 'Re: Running hot, blower issues?'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Several things to check for engine overheat, thermostat primarily, may be sticking/stuck closed. What does temp gauge read?
C3's are notorious for being hot inside passenger compartment. Need good insulation under carpet, make sure all vents are closing, that will let a ton of hot air in. And of course be sure A/C is working. Have an A/C shop check out system.


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7/25/16 8:48pm - Reply: 'Re: Running hot, blower issues?'
buxton161
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Scarborough, MA - USA

Vette(s):
78 Corvette stingray

Joined: 5/30/2016
Posts: 30
thermostat recently changed, ac dose not work, thinking blower as well ( but not clue where it is )

temp is just over 200 immediately, and every fluid leaks, trans, oils and gas from bowl.

Project car indeed, but that's why I am here.



|UPDATED|7/25/2016 6:48:52 PM (AZT)|/UPDATED|
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7/28/16 8:03pm - Reply: 'Re: Running hot, blower issues?'
buxton161
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Scarborough, MA - USA

Vette(s):
78 Corvette stingray

Joined: 5/30/2016
Posts: 30
Bump
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7/28/16 8:13pm - Reply: 'Re: Running hot, blower issues?'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 872
Sorry, but I still don't understand your problem.  Could you take a little more time and post a detailed description.  Maybe have the wife or one of your kids proofread your post.  I don't mean to be mean, but your posts are pretty disjointed.  This place can help you with your cooling problem, we just need more info.  Beer

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7/28/16 8:47pm - Reply: 'Re: Running hot, blower issues?'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19460
 The engine running hot, and the HVAC blower not working are two separate issues.....one has nothing to do with the other.
First off, you need to determine if the engine is actually running that hot. The gauges in these cars are not the most accurate to start with, and the temp senders are notoriously flaky. IF the engine is actually getting that hot that quickly, you have a problem with coolant circulation, whether it is the thermostat(which you state is new), a water pump problem, or a clogged radiator. First try to determine if the gauge is correct. Use an infrared thermometer and measure the temp on the intake manifold where the thermostat is, and the input/output hoses on the radiator. Let's find out for sure what the actual engine temp is first, and we can go from there on how to diagnose what is causing it. Thumbs Up

As far as the blower motor, it is located on the passenger side, under the hood, waaaaay up inside the fender on the firewall. If it is not blowing at all, there are several things that can keep it from working. However...if you have already put 134 freon in the system, at a bare minimum you will need to discharge it, flush the system, evacuate, then put 134 friendly oil in the system, and finish with a new charge of 134.
The blower motor has a resistor set-up in the A/C plenum under the hood that controls the low/low-med/med-high speeds. The high speed(only) is run thru a relay, also mounted on the A/C plenum. You also have the switch in the console, and a fuse to power the whole shebang. Start by testing the fuses.


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7/28/16 8:49pm - Reply: 'Re: Running hot, blower issues?'
buxton161
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Scarborough, MA - USA

Vette(s):
78 Corvette stingray

Joined: 5/30/2016
Posts: 30
Not sure why you would not understand it? Car runs very hot, the engine gets up to 200 and interior as well due to engine Running hot. Ac dose not work at all, I'm told the blower dose not work And I don't know how to test or fix the blower or even What it looks like. Thermostat was changed. Car leaks all fluids , just don't know what to do next
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7/28/16 8:53pm - Reply: 'Re: Running hot, blower issues?'
buxton161
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Scarborough, MA - USA

Vette(s):
78 Corvette stingray

Joined: 5/30/2016
Posts: 30
Now that's support! Ty A A will do !
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7/28/16 10:39pm - Reply: 'Re: Running hot, blower issues?'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 872
dose?

Good info AA.


|UPDATED|7/28/2016 8:39:15 PM (AZT)|/UPDATED|


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7/28/16 9:26pm - Reply: 'Re: Running hot, blower issues?'
buxton161
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Scarborough, MA - USA

Vette(s):
78 Corvette stingray

Joined: 5/30/2016
Posts: 30
Sorry f4, thought I was here to get support from knowledgeable  Vette Owners, not a grammar lesson.

If my grammar upsets You that much, then please ignor my post and don't reply to any as you don't offer support and rather just bust my %#^ when I am asking for support in a support Forum.


|UPDATED|7/28/2016 7:26:00 PM (AZT)|/UPDATED|
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7/28/16 10:46pm - Reply: 'Re: Running hot, blower issues?'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 872
I'm still trying to figure out what the hell is wrong with your car.  Apparently your brand new radiator and cooling fans don't work, some blower doesn't work, and your car leaks like a sieve.  "Dose" that about explain it?  No one knows how to help you because your explanation is all over the place.

I have an LT-1 with air.  I had a lot of overheating problems and I fixed them.  DeWitts helped a lot.  I've been there and done that.

I'm done.


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7/29/16 8:58pm - Reply: 'Re: Running hot, blower issues?'
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 400
I've found new t-stats that are bad so that would be the first thing to check.  Put it in pan of boiling water and it should open assuming its rating is 190 or less.  And their tolerance is about +/- 20%.  I think that they are better than that today.

If the radiator hoses have been replaced, check that the lower hose has the internal spring in it to prevent collapsing which will severely restrict flow.

Is the radiator fan working properly?

Are all of the radiator seals in good condition and in place?

Does it put an excessive amount of water in the overflow reservoir?

Have the radiator cap tested.  Probably should be a 15 psi cap.

Is the front of radiator free of debris?

Is the lower lip under the front intact and in place?

I have a L-82 w/ A/C and have never had an overheating problem.  Just lucky I guess.


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1973 L-82 4 spd

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