Quote:
Originally Posted by artron9
Hi Merc
I thought the valve was normally open? How strong should the engine vacuum be.? It doesn't seem to be strong enough to operate the diaphragm. When I run water thru the valve it flows easily. My wipers are very weak as well. Any way, since I have bypassed the control valve, circulation seems to stop at the heater core since the exit tube is cold! I should have solved this during the summer!
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I don't think the valve would normally be open, because you would have heat all the time. I was under the impression that when you applied vacume to the valve it opened it. I could be wrong though.
I would still be interested in what you find when you take the lower hose off. The cold will break soon, it is nice here today (Colorado), have the garage doors open working on my carb, in just a sweatshirt.
Another option is to remove the heater core housing and then you can touch the fins to see if water is getting through:
1. Remover the two straps connecting the housing with the fan housing.
2. Remove the 4 screws on the heater box. The arrows point to the two on
the top, there are two more on the bottom too.
3. Remove the heater core housing, exposing the hearer core.