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Yep...the old one leaks. Looks like I have a project for this weekend

No, I'm saying there were no hoses connected to the heater core. One hose from the water pump is connected to the surge tank and didn't see where the other was routed too. They are still disconnected right now.

Thanks for the pic. Tomorrow I will try the garden hose trick on the heater core to see if it is in fact leaking...after I put plastic and towels in the floor board. If needed, my weekend is free. I will make plans to swap the heater core :ugh I can't imagine they would have disconnected it...

This is getting better by the day.... So I went out to remove the hoses from what I was thinking was the heater core. Drained it, used hose to spray inside and saw water coming out of the other hole. Cool, heater core not plugged...then it hit me..this is the surge tank, not the heater core...

I probably will put it back in. I changed it out when I was trouble shooting some earlier issues.

I went with the t-stat O'reilly Auto listed online. I picked it up in store and verified the same number. Look exactly like the one I took out. I'll check the heater core like you mentioned in a little while. Have to eat and let the car cool a bit more Thanks again

I'm almost wanting to say the heater core is blocked. I hope not :mad

Yes, the blend door inside where the blower motor module fell in opens and closes. Watched the video and went out to test. I put the blower motor module back in. I have air blowing out of the proper vent when I press either the dash vent or floor vent. Let the car warm up to until the cooling...

Well, the blend door does open. Turned the key on and the heater control was already on auto. Switched to off then began adjusting the up/down arrows to 60 & 90. It immediately switches back to auto

Ok,got the module out , turned the ignition on and adjusted the buttons all the way up and down. I did not see or hear the blend door move at all. The blend door was open about 1/2" but I never felt any heat since I've had the car. Here is a word of wisdom to share: When removing the blower...

Thanks for the replies. I'll go out later and check those out. Scott, I am east of Colorado Springs but I know where Corvette place is. Drove past it several times.

Before I start tearing things apart, is there any way to tell what the problem might be before I dig in? On my 91, I get no heat coming out of the vents, floor or dash. The heater hose lines to the heater core both heat up and the blower fan for the inside works fine. Just looking for any...

Been doing some research here and other forums. Sounds like my miss/stumble could be from dirty IAC. Going to tackle that this weekend and see if it helps

I have a 75 and 91 Corvette. My friend just bout a 98 C5. I drove it home for him. It is, by far, more comfortable than my C3 or C4. The seats are better, the controls seem to be in better reach plus they have the LS1 motor. I am 6ft @240. There is plenty of leg room in the C5 for me. When I buy...

Something else this 91 is doing, after it is driven far enough to warm up there seems to be an occasion miss. I feel it when sitting at a traffic light. It idles smooth and then it feels like a dead spot. It will do this every 5-10 seconds or so. Clears up when driving or at least seems to. No...

haha..thanks :thumb

Yeah, I will keep checking the level and look for leaks while hoping someone didn't do a good job filling it. As for the capacity, I got the 14.6 quarts from this website: 1991 Corvette Specifications - C4 Corvette - www.corvsport.com

Not sure why it was unplugged. The connector is intact. It is now locked into place :cool!: I filled the system to include the overflow. Squeezed top and bottom rad hoses several times to get air out of the system. I then let it get up to temp until the thermostat open and fans kicked on. Let...

So here is a pic of the 91. Bought it from a friend for $5k. Has high miles (194k) but it has a new top and new Goodyear Eagle Zr1's. I'll call it a wash :D. The check engine light was on when I got it but I found the front coolant sensor had came unplugged. Light is gone and now runs and drive...

Copy that. I had planned to do a full tune up once I got that code cleared. I have wondered about the low coolant. Nothing has got in the oil so thats a plus. Also not seeing any steam coming out of the exhaust. My friend has had the car for 2 years and only drove it once. He's also not very...