Maangaadu is located at the outskirts of Chennai near Poondhamalli. While going from Chennai city on Mount Poondhamalli road, one has to take left from Kumananchaavadi junction to reach Maangaadu.
This temple is located very close to Maangaadu Sri Kamakshi Amman temple. This is a very ancient and beautiful temple for Lord Vishnu. The main deity here is Sri Vaikunda Perumaal.
According to the legend, when Goddess Sri Kamakshi performed Thapas here in Maangaadu, Lord Shiva came down to earth to marry Her. Lord Shiva appeared to Sri Kamakshi and directed Her to reach Kanchipuram where He can marry the Goddess.Lord Vishnu, who is the brother of Goddess anticipating the wedding to happen at Maangaadu, came down here with maternal gifts for the bride and waited here.
But as the wedding did not happen here at Maangaadu, Lord Vishnu took abode here as Sri Vaikunda Perumaal with the Jewel (wedding ring) he brought for the Goddess and started blessing devotees.The main deity Sri Vaikunda Perumaal is so beautiful with Sri Devi and Bhu Devi facing east. God is seen holding the wedding ring in his palm. Also He is holding Prayoga Chakra in one of his hands, which is believed to be so powerful.
Goddess here is Sri Kanakavalli Thaayaar having a separate shrine facing east on the outer praakaaram.
Aandaal shrine is found on the northwest corner of the temple, facing east.
The temple also maintains a beautiful Goshala with many cows.Many beautiful statues like Sri Rama, Sri Anjaneya etc, are found on the outer walls of the temple.
It is said that people visiting Sri Kamakshi Amman temple should also have dharshan at Sri Velleeswarar temple and Sri Vaikunda Perumaal temple in Maangaadu, as all these three temples are interconnected with the history of Sri Kamakshi Amman. 
According to the legend, when Goddess Sri Kamakshi performed Thapas here in Maangaadu, Lord Shiva came down to earth to give dharshan to Her and marry Her. It is said that, Sri Sukran (Venus) worshipped Lord Shiva here. When Sri Kamakshi came here to have dharshan of Lord Shiva, she saw Sri Sukran worshipping the Lord. The Goddess went back as She did not want to disturb the prayers of Sukran.
Lingothbavar is seen on the outer wall behind the sanctum. Lord Brahma and Lord Vishnu are present on either side of Lingothbavar worshipping Him.
There is a separate shrine for Sri Veerabadhrar behind the sanctum.
Sri Subramanyar shrine is present at the North West side of the outer praakaaram. Sri Subramanyar is so beautiful and seen with His consorts Sri Valli and Sri Dhevasena. All the 3 deities are made of a single stone. Lord Muruga’s Vaahanam (carrier) peacock is present outside the shrine facing the shrine.
A beautiful Nandhi is present outside the sanctum, facing towards west. It is said that people visiting 
According to temple legend, a king called Bagirathan was ruling a place called Chalankondapuram. Sage Naradha once visited this king and the king didn’t offer any due respect to Naradha. Naradha, who got angry with him, saw an Asura (demon) called Goran, on his way in the forests, who was doing Dhig Vijayam to various territories to defeat various kings.
Bagirathan formed a temple for Lord Muruga near Paadhiri tree and started worshipping. After his sincere prayers, Goran, who captured his kingdom, met Bagirathan and handed it back to him.
Once Lord Indra wanted to worship Lord Muruga and he requested Deva Guru Sri Brahaspathi to guide him to the right place. He was directed to Vallakkottai. He came here and made a pond out of his weapon Vajraayudham and performed Abishegam to the Lord. As Vajraayudham was used to create the pond, the Theertham here is called Vajra Theertham.
Other deities of this temple are Sri Vinayagar, Utsava Murugar, Sri Shanmugar and Sri Ambaal. The Mayil Vaahana is seen near the Bali peetam outside the sanctum.
There is a beautiful Dwajasthambha on the praakaaram, has lovely carvings of Lord Muruga and Vinayagar.
There are also some beautiful sculptures on the pillars of Ardha Mandapam like
Auspicious occasions like Skandha Sashti, Sura Samharam, Aadi Krithgai, Masi Krithigai, Tamil New Year’s day and Thaippoosam are celebrated well in this temple. 

Even today, no abhishekams are performed to the Sri Chakra as it contains rare herbs. Only Kumkuma Archana is performed that too only to the Sri Chakra and not the idol, as the powers of Sri Kamakshi Amman has been instilled in the Chakra by Sri Aadhi Sankaracharya.