76CX39

Thanks for the tips! I'll retighten the clamps and look into the thread sealant. I wonder tho if they can be used for such high temp applications?

Any part numbers stamped inside?

This looks like a mid 80s ('84-'86) Century hood ornament

I noticed coolant seepeage where the upper coolant hose connects to the header outlet and also around the coolant sensor after the engine is turned off/cooled down and the car has been sitting for a while. The pump seems to work fine, plenty of coolant in the reservoir and no diagnostic lights or overheating. No leakage observed with the engine running/hot. i also noticed a drop at the lower radiator hose. Seems like as if too much pressure in the system? The coolant level in the reservoir seems to be fluctuating properly it seems. Any ideas what might be causing this? I have not driven much since last fall, mostly just occasional start ups besides few short drives. I appreciate any advice.

Not sure if you already got them but here they are on ebay: https://www.ebay.com/itm/234666899835?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338722076&customid=&toolid=10050

I have a 1976 Electra myself. Not sure if you have located a pair yet. The passenger side (RH) will be hard to get if it is remote controlled. The LH mirror should be relatively easier to find. There is a listing on eBay for one: https://www.ebay.com/itm/165919059109?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338722076&customid=&toolid=10050 Your best bet for an alternative is try to locate mirrors listed for 1973 to 1978 C bodies. Lesabres (B body) and Rivieras E (body) for those years might use the same ones as well. They should fit with the correct mirror gasket which for the 1976 Electra is part #9874035. You can always cross reference or search part numbers on gmpartswiki.com

Thank you NailheadBob! Well of course! It was in front of my nose all along! I just kept looking under sensor and resistor didn't bother to look through the entire listing under 9.275 because I was expecting it under SENSOR, Ambient or something like that. Feel sheepish, on the other hand why it was listed like that no idea. Both the Cadillac and the older Buick catalog list it as one would expect it under the SENSOR, xxx entry. 🙄

There is no issue with the sensor or the blower but I am always looking to refresh components on the car as well as look for spare parts. It helps me to thoroughly know the car and familiarize myself with automotive technology of the era. You did point me in the right direction and I'm pretty sure I solved the mystery. I kept searching and looking for a resistor when I should have searched for a sensor. With that said I did check before I posted here the entries in the applicable Buick parts catalog for ambient air sensor, however, none was listed for a 76 C. By the way, I get your point about the date of the parts catalog, I discovered myself some numbers missing. However, I also have a 1976 to 1978 catalog issued in April 1978 and even that issue is lacking an entry for SENSOR, Ambient air for a 76 C model. Hence I hit a dead end with the sensor issue. Then based on your suggestion I searched this time the internet for ambient air sensor and that led me to entries in the Buick parts catalog covering models through 1975 and the 1976 to 1978 Cadillac parts catalog. Still not sure why they made no entries in the Buick catalog specifically for a 76 C when there was one in the Cadillac catalog. The Buick listing I found is for 71-15 All with auto AC which would be applicable to 1976 as well.

This weekend I'll remove it and check out what's on the underside, I'll post a picture. I do have the chassis manual but as you can see on the electrical diagram it does show a 2-prong resistor (ambient sensor). Same goes for the parts illustration manual. My parts catalog is from 1987 covering 1976 to 1981 and you would think by that time this part would be listed but that's not the case. The same type of automatic climate control was already available at least in the 1974 model year if so this is not unique to 1976. The closest configuration I came across is a combination of ambient temp switch and resistor that was used on early 70s Cadillacs and Pontiacs. It does have only 2 prongs but also have a button type sensor.

Thank you for your reply! No, it's not the ambient switch, it's the resistor pictured on the second page you scanned. It also pictures a 4-prong resistor which is used for manual or semi-automatic climate control. Here is a picture of the resistor on my car.

I am trying to find the part number for the AC blower resistor for my 76 Electra Park Avenue with fully automatic climate control, GM production code C61. None of the parts cataloges has entry for a resistor for this option. All I could find for a 76 C model is a part number for option C60 which is the manual AC control. The part number listed for this option is 500890 but this resistor has 4 prongs and is very common. The resistor I have has only 2 prongs. I perused parts catalogs for other GM models covering 1976 model year and they also only list a resistor for option C60. If anyone could point me the right direction with my research would be much appreciated!