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I don't have a Corvette per se, but a 1994 Corvette LT-1 powers my '37 Plymouth street rod. I'm trying to get the heater re-plumbed and need to ID the inlet and outlet. Every illustration I have found describes the plumbing as if it were installed in an actual Corvette, so I have found the diagrams confusing.
Here's a picture, and the heater ports have been labeled A and B.
I don't have a Corvette per se, but a 1994 Corvette LT-1 powers my '37 Plymouth street rod. I'm trying to get the heater re-plumbed and need to ID the inlet and outlet. Every illustration I have found describes the plumbing as if it were installed in an actual Corvette, so I have found the diagrams confusing.
Here's a picture, and the heater ports have been labeled A and B.
Which is which?
Welcome!!
This water LT1 Water Pump Appears to be a 94 Malibu. Not the VETTE.. I"m Telling the Plymouth Society you are running a Chevy Engine.
Hopefully this helps out.
This water LT1 Water Pump Appears to be a 94 Malibu. Not the VETTE.. I"m Telling the Plymouth Society you are running a Chevy Engine.
Hopefully this helps out.
Not really any help, but thanks.
I didn't build the car. The engine VIN is definitely Corvette, but the accessories are not. It uses an S-10 power steering pump for example as part of the aftermarket accessory assembly. Had I been able to choose, I would have used an early Red Ram or Firedome Hemi, but the LT-1 has been an excellent performer for over 30,000 miles on road trips.
BTW, I do have a Mopar 360 I plan to put in a Chevy or Ford pickup truck ... just because I can.
That pump is definitely not for a 1994 Corvette LT1 engine. I'd guess it's for the LT1 that was used in one of GM's other passenger cars, such as the Impala SS, but that's only a guess. I can't help with which is inlet and which is outlet. But does the heater core in your hotrod really care which direction it flows?
So hurry up and post some pix of that car -- sounds like a sweet ride!
As for heater core, I agree that it probably doesn't matter which way the coolant flows through the core, but the pipe size should be an indicator. To ME, it looks like A is the outlet for the heater core since it's on the outlet to the block, and B would be the core return.
That pump is definitely not for a 1994 Corvette LT1 engine. I'd guess it's for the LT1 that was used in one of GM's other passenger cars, such as the Impala SS, but that's only a guess. I can't help with which is inlet and which is outlet. But does the heater core in your hotrod really care which direction it flows?
So hurry up and post some pix of that car -- sounds like a sweet ride!
Yes. it does care. There's a cutoff valve on one side that blocks the flow of coolant when the A/C is on. If it's plumbed backwards, the coolant pushes the valve open no matter what.
Last edited by hduff; 10-22-2015 at 01:15 PM.
Reason: typo
Yes. it does care. There's a cutoff valve on one side that blocks the flow of coolant when the A/C is on. If it's plumbed backwards, the coolant pushes the valve open no matter what.
That's a sweet looking ride! Looks mighty fun.
Two thoughts:
1. Dunk the pump in a bucket of water, with the heater hose ports above the surface, rotate the drive shaft in the correct direction, and see what happens.
2. Is the shut-off valve reversible, in the event that you get it plumbed up backward?
1. Dunk the pump in a bucket of water, with the heater hose ports above the surface, rotate the drive shaft in the correct direction, and see what happens.
The pump is still in the car, that was a stock photo. This page identifies the pump as being from an Impala. I should have thought of doing a Google Image search sooner . . .
2. Is the shut-off valve reversible, in the event that you get it plumbed up backward?
SJW
The valve is in an awkward spot and would be a PITA to reverse. Fortunately, there are swappable threaded bulkhead fittings. I'll fill the radiator with plain water, disconnect one hose and turn the engine over and see what happens, a.k.a. the "empirical method".
That's weird...I thought I posted which pipe was for what, in post #6. Oh well.
I thought you did also but perhaps this LT heater flow for the Caprice/Roadmaster explains also. The flow control valve #12 would be in the heater "inlet" port from the supply.
Not knowing exactly how the "hot rod" is plumbed this would be a properly plumbed LT pump in a similar system using a closed coolant system. It shows the flow control valve also.
Thanks, guys. I now have the heater plumbed correctly. It had been plumbed backwards since it was built in May 2001. I also discovered that the fan relay to A/C compressor wiring was done incorrectly such that the compressor running would not cause the radiator fan to run. It's never been a big deal since I don't really used the A/C, but this will make my wife very happy next summer.
After 15 years and 30,000 miles of fun from Florida to Canada, the car is showing some wear and age, but that engine stills runs strong.
10-21-2015, 02:56 PM
Help ID LT-1 water pump ports, please
