Sat. 5/18, No idle alarm or low speed alarm, when I get her up on plane a single constant alarm goes off. I shut it down, wait a minute restart no alarm. I can idle to low speed no heat alarm. No temp gauge. I checked thermostats, tested put back in. These are original , 19 years old I am going to replace. Waterpump psi at idle is 2. Low speed 3 psi, up on plane 6 psi but only for a few seconds. I did a motor flush last fall, no change. Checked poppet valve, took apart cleaned, checked diaphragm, gaskets etc put back in last week, 5/10. Any help suggestions?
thx
Dave