When did the DEX-COOLRrequirement Begin

[Terry M.]

Re: When did the DEX-COOLRrequirement Begin

In OEM application for the B-bodies (and I think D-body LT1 application) that valve (thank you Joe for using the proper terminology) is part of one of the heater hose assemblies. It is available separately as Joe points out. Some of the big car guys replace it with copper fittings from the local hardware or big-box store for an eternal solution, however I am uncertain of the engineering effectiveness of that solution. Others simply eliminate it and the attendant failures. All of these solutions, while functionally more or less effective will do nothing for gaining points in judging.

[Clem Z.]

Re: When did the DEX-COOLRrequirement Begin

Yea, Joe, I had heard it called a valve, I was changing heater hoses and took a look thru it. I thought "what's going on?" , there must be parts missing.

Did some research and found out it actually is a restrictor.

is it in the input or output hose ?? i would guess if it is in the output hose it is there to stop the "gurguling" sound you hear when you start the car till the heater core refills. JMHO

[Bill H.]

Re: When did the DEX-COOLRrequirement Begin

is it in the input or output hose ?? i would guess if it is in the output hose it is there to stop the "gurguling" sound you hear when you start the car till the heater core refills. JMHO

It's on the inlet, Clem. The hose that goes from the throttlebody to the core. The outlet is plumbed into the surge tank.

[John H.]

Re: When did the DEX-COOLRrequirement Begin

I think the gasket technology is much better today for sealing coolant passages in modern engines.

Tim -

The primary reason for the factory-installed Bar's Leaks pellets has always been to avoid minor seepage at radiator and heater hose nipple connections; gaskets under compression in hard joints seldom leak, at least under new car conditions. Two of those pellets have gone into every car and truck radiator on the planet at initial coolant fill since the 50's.

[Timothy B.]

Re: When did the DEX-COOLRrequirement Begin

Thanks John,

I am fairly sure two pellets will eliminate this seepage and if GM used them I guess it's a safe bet to say they will not hurt the cooling system.. I will double check the manifold bolts to make sure they are snug.

[Jim T.]

Re: When did the DEX-COOLRrequirement Begin

Timothy I have used the tablets in my 96 LT4 since it was new and have not had any aluminum radiator problems yet. I have used the tablets in my 96 Monte Carlo with coolant changes since I bought it used. Having the history of service on the Monte I went to the Chev dealership I had a invoice on for coolant change and asked the service rep if they installed the supplement tablets with the coolant change. He did not know what I was talking about.

[Ed N.]

Re: When did the DEX-COOLRrequirement Begin

My 95 came with the green stuff from the factory.

Ed Nieves (51799)
Top Flight

[Joe L.]

Re: When did the DEX-COOLRrequirement Begin

Timothy I have used the tablets in my 96 LT4 since it was new and have not had any aluminum radiator problems yet. I have used the tablets in my 96 Monte Carlo with coolant changes since I bought it used. Having the history of service on the Monte I went to the Chev dealership I had a invoice on for coolant change and asked the service rep if they installed the supplement tablets with the coolant change. He did not know what I was talking about.

Jim------


You should have told the service rep that it would be nice if, AS A GM DEALERSHIP, they would READ AND FOLLOW THE GM SERVICE PROCEDURES when they service a vehicle. Folks that take their vehicles to a GM dealership, where service technicians are supposed to be GM-trained, have a right to expect that their vehicles will be serviced exactly as GM specifies in the service manuals that GM prepares at great effort and cost.

[Patrick H.]

Re: When did the DEX-COOLRrequirement Begin

Jim------


You should have told the service rep that it would be nice if, AS A GM DEALERSHIP, they would READ AND FOLLOW THE GM SERVICE PROCEDURES when they service a vehicle. Folks that take their vehicles to a GM dealership, where service technicians are supposed to be GM-trained, have a right to expect that their vehicles will be serviced exactly as GM specifies in the service manuals that GM prepares at great effort and cost.

Good luck with that.

Brought our vehicle in and I also attached the campaign number + printed out instructions from GM regarding adjusting the transmission shift points on my wife's vehicle (helps to have GM contacts).
The technicians at our local Chevy dealer had no clue what they were supposed to do, and gave it back to us untouched (other than an oil change).
Now I have to drive it to a different town where I'll be able to watch the guy do it because his boss is my patient and I can tell him exactly what I want done and what GM's instructions say to do.